more tests and bugfixes

Reviewed-on: #20
Co-authored-by: Mathias <mathias2784@web.de>

.gitea/workflows/test.yml

@@ -0,0 +1,42 @@
+name: Tests
+
+on: [push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.14"
+      - name: Install uv
+        run: pip install uv
+      - name: Install dependencies
+        run: uv sync --frozen
+      - name: Copy default settings
+        run: cp settings.template.py settings.py
+      - name: Run pytest
+        run: uv run pytest
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.14"
+      - name: Install uv
+        run: pip install uv
+      - name: Install dependencies
+        run: uv sync --frozen
+      - name: Copy default settings
+        run: cp settings.template.py settings.py
+      - name: Check formatting (black)
+        run: uv run black --check . --extend-exclude .venv
+      - name: Lint (ruff)
+        run: uv run ruff check .
+      - name: Typing (mypy)
+        run: uv run mypy .

.gitignore

@@ -6,11 +6,17 @@ dist/
 wheels/
 *.egg-info
 
+# IDE
+.idea
+
 # Virtual environments
 .venv
 
 # Environment variables
 .env
+/settings.py
 
 # Database instances
 *.db
+
+.local

AGENTS.md

@@ -0,0 +1,152 @@
+# finanz-cockpit Agent Instructions
+
+## Setup Commands
+
+```bash
+# Install dependencies
+uv sync
+
+# Run migrations
+uv run alembic upgrade head
+
+# Run all tests
+uv run pytest
+
+# Run a single test file
+uv run pytest tests/test_model_b4wexport.py -v
+```
+
+Use `uv run` for project commands so they use the project-managed Python environment and dependencies.
+
+## Project Structure
+
+- **`src/`**: Application code
+  - `main.py`: CLI entrypoint for CSV ingestion
+  - `db.py`: Database connection management (uses global `_engine` pattern)
+  - `models/`: Pydantic models + SQLAlchemy tables for b4w and comdirect imports
+  - `ingest/`: Data ingestion logic per source
+- **`tests/`**: Tests with fixtures in `conftest.py`
+- **`alembic/versions/`**: Database migrations
+
+## Key Patterns & Gotchas
+
+### Database Configuration
+
+```python
+from src.db import get_engine, get_session, set_engine
+
+# Development: use sqlite://
+os.environ["DATABASE_URL"] = "sqlite://"
+
+# Production/default: sqlite:///finanz.db
+engine = get_engine()  # reads DATABASE_URL or uses default
+with get_session() as session:
+    session.query(...).all()
+```
+
+**Critical**: Tests override engine via `conftest.py`. Never assume global state - always use `get_session()` context manager.
+
+### CSV Format Expectations
+
+- **b4w**: German bank export (CSV) from `/mnt/anbau/Software/Python/finanz-cockpit/scripts/dummy_data/b4w_export_dummy_01.csv`
+- **comdirect**: German bank export (CSV) with fields like `Buchungstag`, `Umsatz in EUR`, `Vorgang`
+
+### Testing Workflow
+
+```bash
+# Tests automatically run migrations via conftest fixture
+uv run pytest tests/ -v --tb=short
+
+# To test without migrations (in-memory SQLite), use DATABASE_URL="sqlite://"
+DATABASE_URL="sqlite://" uv run pytest tests/test_db.py
+```
+
+### Environment Variables
+
+- `DATABASE_URL`: Database connection string (default: `sqlite:///finanz.db`)
+
+## Data Models
+
+Two sources with shared patterns:
+
+- **b4w**: `B4wExport`, `Category`, transactional import to `import_b4w` table + `category` table
+- **comdirect**: `ComdirectGiro`, `ComdirectCreditCard`, `ComdirectDepot`, import to `comdirect_giro` table
+- **unified**: `Transaction`, `TransactionDb` – both ingest pipelines project their staging rows (`import_b4w`, `comdirect_giro`) into one `transactions` table via `src/ingest/transactions.py` (`map_*` mappers + `consolidate_transactions`). Dedup uses a business-key `hash_id` (source + IBAN + value date + amount + text + counterparty) with a UNIQUE constraint and SQLite `INSERT OR IGNORE`, so re-imports are idempotent. Amounts are canonical signed (negative = money out). Depot/credit-card/tagesgeld are not projected yet.
+
+## Category Budget Management (NEW)
+
+Budget tracking for categories with time-bounded or unbounded periods:
+
+```python
+from src.models.category import Category, CategoryBudget
+from datetime import date
+
+cat = Category(name="Lebenshaltung")
+budget = CategoryBudget(
+    category=cat,
+    amount_eur=150.00,
+    valid_from=date(2026, 10, 1),   # Optional: None for unbounded start
+    valid_to=date(2026, 11, 30),     # Optional: None for unbounded end
+)
+
+# Set/replace budget - handles overlap automatically:
+from src.domain_utils import set_category_budget
+set_category_budget(db_session, budget)
+```
+
+The `set_category_budget()` function intelligently handles three scenarios:
+1. **No overlap**: Adds new budget alongside existing ones
+2. **Partial overlap**: Splits existing budget into non-overlapping parts + adds new budget  
+3. **Full overlap**: Replaces existing budget entirely
+
+All models inherit from common base in `src/models/common.py`:
+- `_hash()`: SHA256-based deduplication key
+- `_parse_date_german()`: Handles "07.09.2026" format and values like "offen", "--"
+- `_parse_decimal_german()`: Converts "1,23" to Decimal
+
+## Factory Pattern for Testing
+
+Import from `tests/factories.py`:
+
+```python
+from tests.factories import B4wExportFactory, ComdirectGiroFactory
+from src.constants import Currency
+
+B4wExportFactory.__faker__ = Faker("de_DE")
+ComdirectGiroFactory.__faker__ = Faker("de_DE")
+
+# Use in tests:
+item = B4wExportFactory.build(  # build() for partial, create() for full
+    Amt="50.00",
+    RmtInf="Supermarket",
+)
+```
+
+## Common Mistakes to Avoid
+
+1. **Assuming global engine state**: Always use `get_session()` context manager
+2. **Ignoring German date formats**: Use `_parse_date_german()` for CSV parsing
+3. **Forgetting migration setup in tests**: Tests auto-migrate, but integration tests with real db need explicit upgrade
+4. **Wrong Faker locale**: Use `Faker("de_DE")` for realistic names/IBANs
+
+## Testing Tips
+
+- Run single test: `uv run pytest tests/test_model_b4wexport.py -v`
+- View migrations: `ls alembic/versions/`
+- Test data location: `/scripts/dummy_data/`
+
+### Type Checking (mypy)
+
+```bash
+# Static type checking with mypy
+uv run mypy src/
+
+# With test coverage
+uv run pytest --cov=src --cov-report=term-missing
+```
+
+**Note**: Some comparisons between `date | None` types require explicit guards or type assertions to satisfy mypy, even when the logic is correct. See `src/domain_utils.py` for examples.
+
+## Code Style
+
+- Don't be too verbose in docstrings and comments

README.md

@@ -0,0 +1,193 @@
+# finanz-cockpit
+
+Financial tracking application for German bank exports (b4w, comdirect) with unified transaction processing and category-based budget management.
+
+## Features
+
+- **Dual-source ingestion**: Import transactions from b4w and comdirect CSV exports
+- **Unified transaction table**: All transactions are consolidated into a single `transactions` table using business-key deduplication
+- **Category hierarchy**: Support for nested category structures (e.g., `"Lebenshaltung:Essen:Supermarkt"`)
+- **Budget tracking per category**: Set and manage budgets with time-bounded or unbounded validity periods
+- **Automatic overlap handling**: Smart budget management handles partial/full overlaps automatically
+
+## Installation
+
+```bash
+uv sync
+alembic upgrade head
+```
+
+## Usage
+
+### Import b4w Export
+
+```python
+from src.ingest.b4w import ingest_b4w
+from src.db import get_session
+from pathlib import Path
+
+csv_path = Path("/mnt/anbau/Software/Python/finanz-cockpit/scripts/dummy_data/b4w_export_dummy_01.csv")
+with get_session() as session:
+    ingest_b4w(csv_path, session)
+```
+
+### Import comdirect Export
+
+```python
+from src.ingest.comdirect import ingest_comdirect
+from src.db import get_session
+from pathlib import Path
+
+csv_path = Path("/mnt/anbau/Software/Python/finanz-cockpit/scripts/dummy_data/comdirect_giro_01.csv")
+with get_session() as session:
+    ingest_comdirect(
+        session,
+        csv_path,
+        account_iban="DE89370400440532013000",
+        account_currency="EUR",
+    )
+```
+
+### Set Category Budgets
+
+```python
+from src.models.category import Category, CategoryBudget
+from datetime import date
+from src.domain_utils import set_category_budget
+from src.db import get_session
+
+# Create category hierarchy
+cat = Category.from_str("Lebenshaltung:Essen:Supermarkt")
+
+# Set budget for October-November 2026
+budget = CategoryBudget(
+    category=cat,
+    amount_eur=150.00,
+    valid_from=date(2026, 10, 1),
+    valid_to=date(2026, 11, 30),
+)
+with get_session() as session:
+    set_category_budget(session, budget)
+    session.commit()
+
+    # Budgets can also be unbounded (no dates specified)
+    budget = CategoryBudget(
+        category=cat,
+        amount_eur=200.00,  # Monthly average
+    )
+    set_category_budget(session, budget)
+    session.commit()
+```
+
+## Testing
+
+```bash
+# Run all tests
+pytest
+
+# Run with coverage
+pytest --cov=src --cov-report=term-missing
+
+# Run a single test file
+pytest tests/test_model_b4wexport.py -v
+```
+
+## Project Structure
+
+- **`src/`**: Application code
+  - `main.py`: CLI entrypoint for CSV ingestion
+  - `db.py`: Database connection management
+  - `models/`: Pydantic models + SQLAlchemy tables
+  - `ingest/`: Data ingestion logic per source (b4w, comdirect)
+  - `domain_utils.py`: Domain-level utilities (budget overlap handling)
+- **`tests/`**: Tests with fixtures in `conftest.py`
+- **`alembic/versions/`**: Database migrations
+
+## Data Models
+
+### Transaction Sources
+
+- **b4w**: `B4wExport`, `Category`
+- **comdirect**: `ComdirectGiro`, `ComdirectCreditCard`, `ComdirectDepot`
+- **unified**: `Transaction`, `TransactionDb` – consolidates all sources into one table
+
+All models inherit from common base in `src/models/common.py`:
+- `hash_id()`: SHA256-based deduplication key
+- `_parse_date_german()`: Handles "07.09.2026" format and values like "offen", "--"
+- `_parse_decimal_german()`: Converts "1,23" to Decimal
+
+### Category Budgets
+
+Budget tracking for categories with time-bounded or unbounded periods:
+
+```python
+from src.models.category import Category, CategoryBudget
+
+cat = Category(name="Lebenshaltung")
+budget = CategoryBudget(
+    category=cat,
+    amount_eur=150.00,
+    valid_from=date(2026, 10, 1),   # Optional: None for unbounded start
+    valid_to=date(2026, 11, 30),     # Optional: None for unbounded end
+)
+
+set_category_budget(db_session, budget)
+```
+
+The `set_category_budget()` function handles overlap scenarios automatically:
+1. **No overlap**: Adds new budget alongside existing ones
+2. **Partial overlap**: Splits existing budget into non-overlapping parts + adds new budget  
+3. **Full overlap**: Replaces existing budget entirely
+
+## Development
+
+### Setup
+
+```bash
+# Install dependencies
+uv sync
+
+# Run migrations
+alembic upgrade head
+
+# Run all tests
+pytest
+
+# Run with coverage report
+pytest --cov=src --cov-report=html:htmlcov
+```
+
+### Common Patterns
+
+**Database Session**: Always use `get_session()` context manager:
+
+```python
+from src.db import get_session
+
+with get_session() as session:
+    # query operations here
+    session.commit()
+```
+
+**CSV Format**:
+- **b4w**: German bank export (CSV)
+- **comdirect**: CSV with fields like `Buchungstag`, `Umsatz in EUR`, `Vorgang`
+
+### Testing Workflow
+
+Tests automatically run migrations via `conftest.py`. For testing without migrations:
+
+```bash
+export DATABASE_URL="sqlite://" pytest tests/test_db.py
+```
+
+## Common Mistakes
+
+1. **Global engine state**: Always use `get_session()` context manager
+2. **German date formats**: Use `_parse_date_german()` for CSV parsing
+3. **Migration setup**: Tests auto-migrate, but integration tests need explicit `alembic upgrade head`
+4. **Faker locale**: Use `Faker("de_DE")` for realistic names/IBANs
+
+## License
+
+MIT

alembic/env.py

@@ -6,7 +6,7 @@ from sqlalchemy import engine_from_config, pool
 
 from alembic import context
 from src.db import get_set_engine
-from src.models_db import BaseModelDb
+from src.models.common import BaseModelDb
 
 load_dotenv()  # reads .env into os.environ
 
@@ -65,9 +65,8 @@ def run_migrations_online() -> None:
     and associate a connection with the context.
 
     """
-    if get_set_engine() is not None:
     connectable = get_set_engine()
-    else:
+    if connectable is None:
         connectable = engine_from_config(
             config.get_section(config.config_ini_section, {}),
             prefix="sqlalchemy.",

alembic/versions/605e46acc08e_.py

@@ -5,47 +5,56 @@ Revises:
 Create Date: 2026-09-04 14:52:00.681450
 
 """
-from typing import Sequence, Union
 
-from alembic import op
+from collections.abc import Sequence
+
 import sqlalchemy as sa
 
+from alembic import op
 
 # revision identifiers, used by Alembic.
-revision: str = '605e46acc08e'
+revision: str = "605e46acc08e"
-down_revision: Union[str, Sequence[str], None] = None
+down_revision: str | Sequence[str] | None = None
-branch_labels: Union[str, Sequence[str], None] = None
+branch_labels: str | Sequence[str] | None = None
-depends_on: Union[str, Sequence[str], None] = None
+depends_on: str | Sequence[str] | None = None
 
 
 def upgrade() -> None:
     """Upgrade schema."""
     # ### commands auto generated by Alembic - please adjust! ###
-    op.create_table('category',
+    op.create_table(
-    sa.Column('id', sa.Integer(), autoincrement=True, nullable=False),
+        "category",
-    sa.Column('name', sa.String(), nullable=False),
+        sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
-    sa.Column('parent_id', sa.Integer(), nullable=True),
+        sa.Column("name", sa.String(), nullable=False),
-    sa.ForeignKeyConstraint(['parent_id'], ['category.id'], ),
+        sa.Column("parent_id", sa.Integer(), nullable=True),
-    sa.PrimaryKeyConstraint('id'),
+        sa.ForeignKeyConstraint(
-    sa.UniqueConstraint('name', 'parent_id', name='uq_category_name_parent')
+            ["parent_id"],
+            ["category.id"],
+        ),
+        sa.PrimaryKeyConstraint("id"),
+        sa.UniqueConstraint("name", "parent_id", name="uq_category_name_parent"),
     )
-    op.create_table('import_b4w',
+    op.create_table(
-    sa.Column('id', sa.Integer(), autoincrement=True, nullable=False),
+        "import_b4w",
-    sa.Column('id_b4w', sa.Integer(), nullable=False),
+        sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
-    sa.Column('account_iban', sa.String(), nullable=False),
+        sa.Column("id_b4w", sa.Integer(), nullable=False),
-    sa.Column('account_currency', sa.String(length=3), nullable=False),
+        sa.Column("account_iban", sa.String(), nullable=False),
-    sa.Column('date_valid', sa.Date(), nullable=False),
+        sa.Column("account_currency", sa.String(length=3), nullable=False),
-    sa.Column('date_book', sa.Date(), nullable=True),
+        sa.Column("date_valid", sa.Date(), nullable=False),
-    sa.Column('amount', sa.Numeric(precision=12, scale=2), nullable=False),
+        sa.Column("date_book", sa.Date(), nullable=True),
-    sa.Column('amount_currency', sa.String(length=3), nullable=False),
+        sa.Column("amount", sa.Numeric(precision=12, scale=2), nullable=False),
-    sa.Column('reference', sa.String(), nullable=True),
+        sa.Column("amount_currency", sa.String(length=3), nullable=False),
-    sa.Column('other_name', sa.String(), nullable=True),
+        sa.Column("reference", sa.String(), nullable=True),
-    sa.Column('other_iban', sa.String(), nullable=True),
+        sa.Column("other_name", sa.String(), nullable=True),
-    sa.Column('category_id', sa.Integer(), nullable=True),
+        sa.Column("other_iban", sa.String(), nullable=True),
-    sa.Column('notes', sa.String(), nullable=True),
+        sa.Column("category_id", sa.Integer(), nullable=True),
-    sa.ForeignKeyConstraint(['category_id'], ['category.id'], ),
+        sa.Column("notes", sa.String(), nullable=True),
-    sa.PrimaryKeyConstraint('id'),
+        sa.ForeignKeyConstraint(
-    sa.UniqueConstraint('id_b4w')
+            ["category_id"],
+            ["category.id"],
+        ),
+        sa.PrimaryKeyConstraint("id"),
+        sa.UniqueConstraint("id_b4w"),
     )
     # ### end Alembic commands ###
 
@@ -53,6 +62,6 @@ def upgrade() -> None:
 def downgrade() -> None:
     """Downgrade schema."""
     # ### commands auto generated by Alembic - please adjust! ###
-    op.drop_table('import_b4w')
+    op.drop_table("import_b4w")
-    op.drop_table('category')
+    op.drop_table("category")
     # ### end Alembic commands ###

alembic/versions/78ec55b9e1d1_create_transactions_table.py

@@ -0,0 +1,60 @@
+"""create transactions table
+
+Revision ID: 78ec55b9e1d1
+Revises: 8822a28b01ca
+Create Date: 2026-10-10 16:32:10.691919
+
+"""
+
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "78ec55b9e1d1"
+down_revision: str | Sequence[str] | None = "8822a28b01ca"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    op.create_table(
+        "transactions",
+        sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
+        sa.Column("hash_id", sa.String(), nullable=False),
+        sa.Column("source", sa.String(), nullable=False),
+        sa.Column("source_row_id", sa.Integer(), nullable=False),
+        sa.Column("account_iban", sa.String(), nullable=False),
+        sa.Column("account_currency", sa.String(length=3), nullable=False),
+        sa.Column("date_valid", sa.Date(), nullable=False),
+        sa.Column("date_book", sa.Date(), nullable=True),
+        sa.Column("amount", sa.Numeric(precision=12, scale=2), nullable=False),
+        sa.Column("amount_currency", sa.String(length=3), nullable=False),
+        sa.Column("text", sa.String(), nullable=True),
+        sa.Column("other_name", sa.String(), nullable=True),
+        sa.Column("other_iban", sa.String(), nullable=True),
+        sa.Column("category_id", sa.Integer(), nullable=True),
+        sa.ForeignKeyConstraint(
+            ["category_id"],
+            ["category.id"],
+        ),
+        sa.PrimaryKeyConstraint("id"),
+        sa.UniqueConstraint("hash_id", name="uq_transactions_hash"),
+    )
+    op.create_index(
+        "ix_transactions_source_row_id",
+        "transactions",
+        ["source", "source_row_id"],
+        unique=False,
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    op.drop_index("ix_transactions_source_row_id", table_name="transactions")
+    op.drop_table("transactions")
+    # ### end Alembic commands ###

alembic/versions/8822a28b01ca_.py

@@ -0,0 +1,52 @@
+"""empty message
+
+Revision ID: 8822a28b01ca
+Revises: 605e46acc08e
+Create Date: 2026-09-11 11:13:48.650768
+
+"""
+
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "8822a28b01ca"
+down_revision: str | Sequence[str] | None = "605e46acc08e"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table(
+        "comdirect_giro",
+        sa.Column("type", sa.String(), nullable=True),
+        sa.Column("date_book", sa.Date(), nullable=True),
+        sa.Column("account_iban", sa.String(), nullable=False),
+        sa.Column("account_currency", sa.String(length=3), nullable=False),
+        sa.Column("amount_currency", sa.String(length=3), nullable=False),
+        sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
+        sa.Column("hash_id", sa.String(), nullable=False),
+        sa.Column("date_valid", sa.Date(), nullable=False),
+        sa.Column("amount", sa.Numeric(precision=12, scale=2), nullable=False),
+        sa.Column("text", sa.String(), nullable=True),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.add_column("import_b4w", sa.Column("hash_id", sa.String(), nullable=False))
+    op.add_column("import_b4w", sa.Column("text", sa.String(), nullable=True))
+    op.drop_column("import_b4w", "reference")
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column("import_b4w", sa.Column("reference", sa.VARCHAR(), nullable=True))
+    op.drop_column("import_b4w", "text")
+    op.drop_column("import_b4w", "hash_id")
+    op.drop_table("comdirect_giro")
+    # ### end Alembic commands ###

alembic/versions/c18ae67f4b2a_merge_category_feature_heads.py

@@ -0,0 +1,23 @@
+"""merge category validity and budget migration branches
+
+Revision ID: c18ae67f4b2a
+Revises: d9c6533f8a1b, fe23064de1c5
+Create Date: 2026-10-27
+
+"""
+
+from collections.abc import Sequence
+
+# revision identifiers, used by Alembic.
+revision: str = "c18ae67f4b2a"
+down_revision: str | Sequence[str] | None = ("d9c6533f8a1b", "fe23064de1c5")
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    pass
+
+
+def downgrade() -> None:
+    pass

alembic/versions/d9c6533f8a1b_add_category_validity.py

@@ -0,0 +1,102 @@
+"""add temporal validity to categories
+
+Revision ID: d9c6533f8a1b
+Revises: 78ec55b9e1d1
+Create Date: 2026-10-25 00:00:00.000000
+
+"""
+
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "d9c6533f8a1b"
+down_revision: str | Sequence[str] | None = "78ec55b9e1d1"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    with op.batch_alter_table("category") as batch_op:
+        batch_op.drop_constraint("uq_category_name_parent", type_="unique")
+        batch_op.add_column(
+            sa.Column(
+                "valid_from",
+                sa.DateTime(timezone=True),
+                nullable=True,
+                info={
+                    "description": "UTC start of validity; NULL means valid since the indefinite past."
+                },
+            )
+        )
+        batch_op.add_column(
+            sa.Column(
+                "valid_to",
+                sa.DateTime(timezone=True),
+                nullable=True,
+                info={
+                    "description": "UTC end of validity; NULL means the version is currently valid."
+                },
+            )
+        )
+        batch_op.add_column(
+            sa.Column(
+                "last_action",
+                sa.String(),
+                nullable=False,
+                server_default="created",
+                info={
+                    "description": "Most recent lifecycle action recorded for this category version."
+                },
+            )
+        )
+
+    # Existing rows predate temporal tracking, so their start is unbounded.
+    op.execute("UPDATE category SET last_action = 'migrated'")
+
+    # Separate root and non-root indexes so NULL parent IDs are unique too.
+    op.create_index(
+        "uq_category_active_name_parent",
+        "category",
+        ["name", "parent_id"],
+        unique=True,
+        sqlite_where=sa.text("valid_to IS NULL AND parent_id IS NOT NULL"),
+        postgresql_where=sa.text("valid_to IS NULL AND parent_id IS NOT NULL"),
+    )
+    op.create_index(
+        "uq_category_active_root_name",
+        "category",
+        ["name"],
+        unique=True,
+        sqlite_where=sa.text("valid_to IS NULL AND parent_id IS NULL"),
+        postgresql_where=sa.text("valid_to IS NULL AND parent_id IS NULL"),
+    )
+
+
+def downgrade() -> None:
+    bind = op.get_bind()
+    has_temporal_history = bind.execute(
+        sa.text(
+            "SELECT 1 FROM category "
+            "WHERE valid_from IS NOT NULL OR valid_to IS NOT NULL LIMIT 1"
+        )
+    ).first()
+    if has_temporal_history:
+        raise RuntimeError(
+            "Cannot downgrade category validity while temporal history exists; "
+            "the downgrade would discard it."
+        )
+
+    op.drop_index("uq_category_active_root_name", table_name="category")
+    op.drop_index("uq_category_active_name_parent", table_name="category")
+
+    with op.batch_alter_table("category") as batch_op:
+        batch_op.drop_column("last_action")
+        batch_op.drop_column("valid_to")
+        batch_op.drop_column("valid_from")
+        batch_op.create_unique_constraint(
+            "uq_category_name_parent", ["name", "parent_id"]
+        )

alembic/versions/fe23064de1c5_create_category_budget_table.py

@@ -0,0 +1,52 @@
+"""create category_budget table
+
+Revision ID: fe23064de1c5
+Revises: 78ec55b9e1d1
+Create Date: 2026-10-16 10:43:24.952699
+
+"""
+
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "fe23064de1c5"
+down_revision: str | Sequence[str] | None = "78ec55b9e1d1"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table(
+        "category_budget",
+        sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
+        sa.Column("category_id", sa.Integer(), nullable=False),
+        sa.Column("amount_eur", sa.Numeric(precision=12, scale=2), nullable=False),
+        sa.Column("valid_from", sa.Date(), nullable=True),
+        sa.Column("valid_to", sa.Date(), nullable=True),
+        sa.ForeignKeyConstraint(
+            ["category_id"],
+            ["category.id"],
+        ),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index(
+        "ix_category_budget_category_id",
+        "category_budget",
+        ["category_id"],
+        unique=False,
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index("ix_category_budget_category_id", table_name="category_budget")
+    op.drop_table("category_budget")
+    # ### end Alembic commands ###

cateory-tree-sketch.json

@@ -0,0 +1,27 @@
+{
+  "month": "2026-10",
+  "categories": [
+    {
+      "category": "super-category-1",
+      "total_amount": 100,
+      "total_budget": 120,
+      "sub_categories": [
+        {
+          "category": "category-1",
+          "total_amount": 60,
+          "total_budget": 50,
+          "sub_categories": [],
+          "transactions": []
+        },
+        {
+          "category": "category-2",
+          "total_amount": 40,
+          "total_budget": 60,
+          "sub_categories": [],
+          "transactions": []
+        }
+      ],
+      "transactions": []
+    }
+  ]
+}

pyproject.toml

@@ -11,8 +11,10 @@ dependencies = [
     "alembic>=1.19.1",
     "argparse>=1.4.0",
     "dotenv>=0.9.9",
+    "mypy>=2.4.0",
     "pydantic>=2.13.5",
     "pytest>=9.1.1",
+    "pytest-cov>=7.1.0",
     "python-dotenv>=1.2.3",
     "sqlalchemy>=2.0.52",
 ]
@@ -28,7 +30,39 @@ module-root = ""
 requires = ["uv_build>=0.12.9,<0.13.0"]
 build-backend = "uv_build"
 
+[tool.mypy]
+explicit_package_bases = true
+mypy_path = "."
+exclude = ["^tests/"]
+
+[tool.ruff]
+target-version = "py314"
+
+[tool.black]
+target-version = [ "py314" ]
+
+[tool.ruff.lint]
+ignore = ["EXE"]
+
 [dependency-groups]
 dev = [
+    "black>=26.5.1",
+    "debugpy>=1.8.21",
+    "faker>=40.38.0",
     "polyfactory>=3.3.0",
+    "ruff>=0.16.7",
+]
+
+[tool.coverage.run]
+branch = true
+source = ["src"]
+
+[tool.coverage.report]
+fail_under = 85
+skip_covered = true
+exclude_lines = [
+    "pragma: no cover",
+    "raise NotImplementedError",
+    "if __name__ == .__main__.:",
+    "^[a-zA-Z_]+\\s*=\\s*$"
 ]

scripts/dummy_data/comdirect_export_template.txt

@@ -0,0 +1,25 @@
+;
+"Umsätze Girokonto";"Zeitraum: 180 Tage";
+"Neuer Kontostand";"2.363,30 EUR";
+
+{table_giro}
+
+"Alter Kontostand";"1.632,48 EUR";
+
+"Umsätze Visa-Karte (Kreditkarte)";"Zeitraum: 180 Tage";
+"Neuer Kontostand";"0,00 EUR";
+
+{table_credit_card}
+
+"Alter Kontostand";"0,00 EUR";
+
+"Umsätze Tagesgeld PLUS-Konto";"Zeitraum: 180 Tage";
+"Neuer Kontostand";"1.673,90 EUR";
+
+{table_tagesgeld}
+
+"Alter Kontostand";"6.686,20 EUR";
+
+"Umsätze Depot";"Zeitraum: 180 Tage";
+
+{table_depot}

scripts/dummy_data/generate_dummies_b4w.py

@@ -0,0 +1,22 @@
+import csv
+from pathlib import Path
+
+from tests.factories import B4wExportFactory
+
+NUMBER_OF_ROWS = 50
+DEFAULT_PATH = Path("tests/test_data/b4w_export_dummy_01.csv")
+
+
+def save_csv(path: Path = DEFAULT_PATH):
+    data = B4wExportFactory.batch(NUMBER_OF_ROWS)
+    row_fields = list(data[0].parameters_to_dict())
+    path.parent.mkdir(parents=True, exist_ok=True)
+    with path.open("w", newline="") as fid:
+        writer = csv.DictWriter(fid, fieldnames=row_fields)
+        writer.writeheader()
+        for export in data:
+            writer.writerow(export.parameters_to_dict())
+
+
+if __name__ == "__main__":
+    save_csv()

scripts/dummy_data/generate_dummies_comdirect.py

@@ -0,0 +1,61 @@
+from pathlib import Path
+
+from tests.factories import (
+    ComdirectCreditCardFactory,
+    ComdirectDepotFactory,
+    ComdirectGiroFactory,
+)
+
+DEFAULT_PATH = Path("tests/test_data/comdirect_export_dummy_01.txt")
+TEMPLATE_PATH = Path("scripts/dummy_data/comdirect_export_template.txt")
+
+NUMBER_OF_ROWS_GIRO = 50
+NUMBER_OF_ROWS_CREDIT = 20
+NUMBER_OF_ROWS_TAGESGELD = 10
+NUMBER_OF_ROWS_DEPOT = 10
+
+
+def save(path: Path = DEFAULT_PATH):
+    with TEMPLATE_PATH.open("r", encoding="latin-1") as fid:
+        txt_temp = fid.read()
+    assert isinstance(txt_temp, str)
+
+    batches = {
+        "giro": {
+            "data": ComdirectGiroFactory.batch(NUMBER_OF_ROWS_GIRO),
+            "table_txt": "",
+        },
+        "credit": {
+            "data": ComdirectCreditCardFactory.batch(NUMBER_OF_ROWS_CREDIT),
+            "table_txt": "",
+        },
+        "tagesgled": {
+            "data": ComdirectGiroFactory.batch(NUMBER_OF_ROWS_TAGESGELD),
+            "table_txt": "",
+        },
+        "depot": {
+            "data": ComdirectDepotFactory.batch(NUMBER_OF_ROWS_DEPOT),
+            "table_txt": "",
+        },
+    }
+
+    for batch in batches.values():
+        data = batch.get("data")
+        assert isinstance(data, list)
+        lines = [data[0].get_orig_headers()]
+        lines = lines + [row.get_orig_row() for row in data]
+        batch["table_txt"] = "\n".join(lines)
+
+    txt = txt_temp.format(
+        table_giro=batches["giro"]["table_txt"],
+        table_credit_card=batches["credit"]["table_txt"],
+        table_tagesgeld=batches["tagesgled"]["table_txt"],
+        table_depot=batches["depot"]["table_txt"],
+    )
+
+    with path.open("w", newline="") as fid:
+        fid.write(txt)
+
+
+if __name__ == "__main__":
+    save()

scripts/initial_load/categories/categories.txt

@@ -0,0 +1,35 @@
+Girokonto:Beruf / Ausbildung
+Girokonto:Beruf / Ausbildung:Gehalt
+Girokonto:Beruf / Ausbildung:Reisekosten
+Girokonto:Freizeit
+Girokonto:Freizeit:Abo
+Girokonto:Freizeit:Elektronik&Hardware
+Girokonto:Freizeit:Foto
+Girokonto:Freizeit:Medien
+Girokonto:Freizeit:Musikintrumente
+Girokonto:Freizeit:Urlaub&Ausflüge
+Girokonto:Freizeit:sonst.
+Girokonto:Lebenshaltung
+Girokonto:Lebenshaltung:Auto
+Girokonto:Lebenshaltung:Bekleidung
+Girokonto:Lebenshaltung:Fahrrad
+Girokonto:Lebenshaltung:Gesundheit
+Girokonto:Lebenshaltung:Haushalt sonst.
+Girokonto:Lebenshaltung:Heimwerken
+Girokonto:Lebenshaltung:Kontoführung
+Girokonto:Lebenshaltung:Körperpflege
+Girokonto:Lebenshaltung:Lebensmittel
+Girokonto:Lebenshaltung:Telekommunikation
+Girokonto:Lebenshaltung:Versicherungen
+Girokonto:Privat
+Girokonto:Privat:Geschenke
+Girokonto:Privat:Mitgliedsbeiträge
+Girokonto:Privat:Steuerausgleich Ehetine
+Girokonto:Sonstiges
+Girokonto:Sparen
+Girokonto:Sparen:Depot
+Girokonto:Sparen:Tagesgeld
+Girokonto:unbestimmte Verwendung:Bargeld
+Girokonto:unbestimmte Verwendung:Kreditkarte
+Haushaltskonto:Beiträge
+Umbuchung

scripts/initial_load/categories/extract_categories.py

@@ -0,0 +1,54 @@
+#!/usr/bin/env python3
+"""Extract unique categories from b4w CSV export."""
+
+import argparse
+import csv
+from pathlib import Path
+
+
+def extract_unique_categories(csv_path: str, output_path: str) -> list[str]:
+    """Merge CSV categories with the existing output file, sorted, one per line."""
+
+    unique_categories: set[str] = set()
+
+    with open(csv_path, "r", encoding="utf-8") as f:
+        reader = csv.DictReader(f)
+        for row in reader:
+            category = (row.get("Category") or "").strip()
+            if category:
+                unique_categories.add(category)
+
+    output_file_path = Path(output_path)
+    if output_file_path.exists():
+        with open(output_file_path, "r", encoding="utf-8") as f:
+            for line in f:
+                if category := line.strip():
+                    unique_categories.add(category)
+
+    sorted_categories = sorted(unique_categories)
+
+    with open(output_file_path, "w", encoding="utf-8") as f:
+        f.writelines(f"{cat}\n" for cat in sorted_categories)
+
+    print(f"Extracted {len(sorted_categories)} unique categories")
+    print(f"Output written to: {output_path}")
+    return sorted_categories
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(
+        description="Extract unique categories from a b4w CSV export."
+    )
+    parser.add_argument("--csv", required=True, help="Pfad der b4w-Exportdatei (CSV)")
+    parser.add_argument(
+        "--output",
+        default="scripts/initial_load/categories/categories.txt",
+        help="Pfad der Ausgabedatei (Default: %(default)s)",
+    )
+    args = parser.parse_args()
+
+    extract_unique_categories(args.csv, args.output)
+
+
+if __name__ == "__main__":
+    main()

settings.template.py

@@ -0,0 +1,59 @@
+from pathlib import Path
+
+from faker import Faker
+
+from src.constants import Currency
+from src.models import (
+    ComdirectCreditCard,
+    ComdirectDepot,
+    ComdirectGiro,
+)
+from src.models.b4w import B4wExport
+from src.models.settings import Account, Source
+
+fake = Faker()
+
+BANK_ACCOUNTS = {
+    "b4w": Source(
+        name="b4w",
+        source_path=Path(""),
+        accounts=[
+            Account(
+                name="b4w",
+                model=B4wExport,
+                iban=fake.iban(),
+                currency=Currency.EUR,
+            )
+        ],
+    ),
+    "comdirect": Source(
+        name="comdirect",
+        source_path=Path(""),
+        accounts=[
+            Account(
+                name="Girokonto",
+                model=ComdirectGiro,
+                iban=fake.iban(),
+                currency=Currency.EUR,
+            ),
+            Account(
+                name="Visa-Karte (Kreditkarte)",
+                model=ComdirectCreditCard,
+                iban=fake.iban(),
+                currency=Currency.EUR,
+            ),
+            Account(
+                name="Tagesgeld PLUS-Konto",
+                model=ComdirectGiro,
+                iban=fake.iban(),
+                currency=Currency.EUR,
+            ),
+            Account(
+                name="Depot",
+                model=ComdirectDepot,
+                iban=fake.iban(),
+                currency=Currency.EUR,
+            ),
+        ],
+    ),
+}

src/constants.py

@@ -0,0 +1,16 @@
+from enum import Enum
+
+IBAN_PATTERN = r"^[A-Z]{2}\d{2}[A-Z0-9]{11,30}$"
+
+
+class Currency(str, Enum):
+    EUR = "EUR"
+    USD = "USD"
+    GBP = "GBP"
+    CHF = "CHF"
+
+    def __str__(self):
+        return f"{self.value}"
+
+    def __repr__(self):
+        return f"Currency.{self.name}"

src/db.py

@@ -1,5 +1,3 @@
-#!/bin/python
-
 import os
 from collections.abc import Generator
 from contextlib import contextmanager

src/db_utils.py

@@ -0,0 +1,34 @@
+from typing import Any
+
+from sqlalchemy.orm import DeclarativeBase, Session
+
+
+def _query_existing[DbModelT: DeclarativeBase](
+    session: Session, DbModel: type[DbModelT], query_parameters: dict[str, Any]
+) -> DbModelT | None:
+    query = session.query(DbModel).filter_by(**query_parameters)
+    return query.first()
+
+
+def upsert[DbModelT: DeclarativeBase](
+    session: Session,
+    DbModel: type[DbModelT],
+    parameters_existing: dict[str, Any],
+    parameters_new: dict[str, Any],
+    do_update: bool = False,
+    do_commit: bool = True,
+) -> DbModelT:
+    existing_db_row = _query_existing(session, DbModel, parameters_existing)
+
+    if existing_db_row:
+        if do_update:
+            for key, value in parameters_new.items():
+                setattr(existing_db_row, key, value)
+        return existing_db_row
+
+    new_db_row = DbModel(**parameters_new)
+    session.add(new_db_row)
+    session.flush()
+    if do_commit:
+        session.commit()
+    return new_db_row

src/domain_utils.py

@@ -0,0 +1,149 @@
+from datetime import date, timedelta
+from decimal import Decimal
+
+from sqlalchemy.orm import Session
+
+from src.models.category import Category, CategoryBudget, CategoryBudgetDb, CategoryDb
+
+ONE_DAY = timedelta(days=1)
+
+
+def find_category_db(session: Session, category: Category | None) -> CategoryDb | None:
+    """Find a CategoryDb in the database given a Pydantic Category object.
+
+    Recursively finds parent categories to build the full hierarchy path.
+    Returns None if any part of the hierarchy doesn't exist.
+    """
+    if category is None:
+        return None
+
+    def find_existing(node: Category) -> CategoryDb | None:
+        if node.parent is None:
+            parent_id = None
+        else:
+            parent_db = find_existing(node.parent)
+            if parent_db is None:
+                return None
+            parent_id = parent_db.id
+
+        return (
+            session.query(CategoryDb)
+            .filter_by(name=node.name, parent_id=parent_id)
+            .filter(CategoryDb.valid_to.is_(None))
+            .one_or_none()
+        )
+
+    return find_existing(category)
+
+
+def set_category_budget(session: Session, category_budget: CategoryBudget):
+    """Set or update a category budget, handling overlaps correctly.
+
+    This function handles three cases:
+    1. No overlap: Add the new budget alongside existing ones
+    2. Partial overlap: Split the existing budget and add appropriate parts + new budget
+    3. Full overlap: Replace the existing budget entirely with the new one
+
+    Args:
+        session: SQLAlchemy session
+        category_budget: The budget to set/update
+
+    Raises:
+        ValueError: If the category doesn't exist in the database
+    """
+    # Find the category in the database
+    category_db = find_category_db(session, category_budget.category)
+    if category_db is None:
+        raise ValueError(
+            f"No matching category in database for category: {category_budget.category.to_str()}"
+        )
+
+    new_start = category_budget.valid_from
+    new_end = category_budget.valid_to
+    new_amount = category_budget.amount_eur
+
+    # Helper to add a budget row
+    def _add_row(amount_eur: Decimal, valid_from: date | None, valid_to: date | None):
+        return CategoryBudgetDb(
+            category_id=category_db.id,
+            amount_eur=amount_eur,
+            valid_from=valid_from,
+            valid_to=valid_to,
+        )
+
+    # Helper to check if two date ranges overlap
+    def _ranges_overlap(
+        start1: date | None, end1: date | None, start2: date | None, end2: date | None
+    ) -> bool:
+        """Check if two date ranges overlap."""
+        range1_unbounded = start1 is None and end1 is None
+        range2_unbounded = start2 is None and end2 is None
+
+        # A fully unbounded budget acts as a default alongside bounded budgets.
+        if range1_unbounded and range2_unbounded:
+            return True
+        if range1_unbounded or range2_unbounded:
+            return False
+
+        # None on one side of a partially bounded range means infinity. Date
+        # endpoints are inclusive, so equal endpoints also overlap.
+        starts_before_end1 = end1 is None or start2 is None or start2 <= end1
+        starts_before_end2 = end2 is None or start1 is None or start1 <= end2
+        return starts_before_end1 and starts_before_end2
+
+    # Helper to find overlapping sub-range
+    def _overlap_range(
+        start1: date | None, end1: date | None, start2: date | None, end2: date | None
+    ) -> tuple[date | None, date | None]:
+        """Return the overlapping sub-range of two ranges."""
+        o_start = max((s for s in (start1, start2) if s is not None), default=None)
+        o_end = min((e for e in (end1, end2) if e is not None), default=None)
+        return (o_start, o_end)
+
+    existing_budgets = (
+        session.query(CategoryBudgetDb).filter_by(category_id=category_db.id).all()
+    )
+
+    def _remove_and_split_budget(budget: CategoryBudgetDb):
+        """Remove the overlapping parts of an existing budget and add back non-overlapping parts."""
+        overlap_start, overlap_end = _overlap_range(
+            new_start, new_end, budget.valid_from, budget.valid_to
+        )
+
+        # Keep the old budget's portion before the new range, if any.
+        if overlap_start is not None and (
+            budget.valid_from is None or budget.valid_from < overlap_start
+        ):
+            session.add(
+                _add_row(
+                    budget.amount_eur,
+                    budget.valid_from,
+                    overlap_start - ONE_DAY,
+                )
+            )
+
+        # Keep the old budget's portion after the new range, if any.
+        if overlap_end is not None and (
+            budget.valid_to is None or overlap_end < budget.valid_to
+        ):
+            session.add(
+                _add_row(
+                    budget.amount_eur,
+                    overlap_end + ONE_DAY,
+                    budget.valid_to,
+                )
+            )
+
+    # Process each existing budget
+    for existing_budget in existing_budgets:
+        if not _ranges_overlap(
+            new_start, new_end, existing_budget.valid_from, existing_budget.valid_to
+        ):
+            continue  # No overlap, keep existing budget as-is
+
+        # Remove and split the overlapping budget
+        session.delete(existing_budget)
+        _remove_and_split_budget(existing_budget)
+
+    # Add the requested budget once, even if it replaced multiple existing rows.
+    session.add(_add_row(new_amount, new_start, new_end))

src/helper_db.py

@@ -1,77 +0,0 @@
-#!/bin/python
-
-from typing import Any
-
-from sqlalchemy.orm import Session
-
-from src.models import B4wExport, Category
-from src.models_db import B4wDb, BaseModelDb, CategoryDb
-
-
-def _query_existing(
-    session: Session, DbModel: type[BaseModelDb], query_parameters: dict[str, Any]
-) -> BaseModelDb | None:
-    query = session.query(DbModel).filter_by(**query_parameters)
-    return query.first()
-
-
-def _upsert[DbModelT: BaseModelDb](
-    session: Session,
-    DbModel: type[DbModelT],
-    parameters_existing: dict[str, Any],
-    parameters_new: dict[str, Any],
-    do_update: bool = False,
-    do_commit: bool = True,
-) -> DbModelT:
-    existing_db_row = _query_existing(session, DbModel, parameters_existing)
-
-    if existing_db_row:
-        if do_update:
-            for key, value in parameters_new.items():
-                setattr(existing_db_row, key, value)
-        assert isinstance(existing_db_row, DbModel)
-        return existing_db_row
-
-    new_db_row = DbModel(**parameters_new)
-    session.add(new_db_row)
-    session.flush()
-    if do_commit:
-        session.commit()
-    return new_db_row
-
-
-def upsert_category(
-    session: Session, category: Category | None, do_commit=True
-) -> CategoryDb | None:
-    if category is None:
-        return None
-    parameters = {
-        "name": category.name,
-        "parent": upsert_category(session, category.parent),
-    }
-    return _upsert(session, CategoryDb, parameters, parameters, do_update=False, do_commit=do_commit)
-
-
-def upsert_b4w(
-    session: Session, data: B4wExport, do_update=False, do_commit=True
-) -> B4wDb | None:
-    category_db = upsert_category(session, data.category)
-    
-    parameters_existing = {"id_b4w": data.id}
-
-    parameters_new = {
-        "id_b4w": data.id,
-        "account_iban": data.account_iban,
-        "account_currency": data.account_currency.value,
-        "date_valid": data.date_valid,
-        "date_book": data.date_book,
-        "amount": data.amount_signed,
-        "amount_currency": data.amount_currency.value,
-        "reference": data.reference,
-        "other_name": data.other_name,
-        "other_iban": data.other_iban,
-        "category": category_db,
-        "notes": data.notes,
-    }
-    
-    return _upsert(session, B4wDb, parameters_existing, parameters_new, do_update=do_update, do_commit=do_commit)

src/ingest/b4w.py

@@ -0,0 +1,149 @@
+from datetime import UTC, datetime
+from pathlib import Path
+
+from sqlalchemy.orm import Session
+
+from src.db_utils import upsert
+from src.ingest.common import _reader_raw
+from src.ingest.transactions import consolidate_transactions, map_b4w_to_transaction
+from src.models.b4w import B4wDb, B4wExport
+from src.models.category import Category, CategoryDb, upsert_category
+
+
+def reader_b4w(path: Path) -> list[B4wExport]:
+    raw = _reader_raw(path)
+    return list(map(B4wExport.model_validate, raw))
+
+
+def _utc_datetime(value: datetime | None) -> datetime:
+    if value is None:
+        return datetime.now(UTC)
+    if value.tzinfo is None or value.utcoffset() is None:
+        return value.replace(tzinfo=UTC)
+    return value.astimezone(UTC)
+
+
+def _ensure_after_valid_from(category: CategoryDb, effective_at: datetime) -> None:
+    if category.valid_from is None:
+        return
+    valid_from = _utc_datetime(category.valid_from)
+    if effective_at <= valid_from:
+        raise ValueError("The action time must be later than valid_from")
+
+
+def change_category(
+    session: Session,
+    category_id: int,
+    replacement: Category,
+    effective_at: datetime | None = None,
+    do_commit: bool = True,
+) -> CategoryDb:
+    """Close an active category version and start its replacement version."""
+    current = (
+        session.query(CategoryDb).filter_by(id=category_id, valid_to=None).one_or_none()
+    )
+    if current is None:
+        raise ValueError(f"No active category found with id {category_id}")
+
+    action_time = _utc_datetime(effective_at)
+    _ensure_after_valid_from(current, action_time)
+    parent = upsert_category(session, replacement.parent, do_commit=False)
+    parent_id = parent.id if parent else None
+
+    if current.name == replacement.name and current.parent_id == parent_id:
+        return current
+
+    replacement_active = (
+        session.query(CategoryDb)
+        .filter_by(name=replacement.name, parent_id=parent_id, valid_to=None)
+        .one_or_none()
+    )
+
+    current.valid_to = action_time
+    current.last_action = "changed"
+    session.flush()
+
+    if replacement_active is None:
+        replacement_active = CategoryDb(
+            name=replacement.name,
+            parent=parent,
+            valid_from=action_time,
+            valid_to=None,
+            last_action="changed",
+        )
+        session.add(replacement_active)
+        session.flush()
+
+    if do_commit:
+        session.commit()
+    return replacement_active
+
+
+def retire_category(
+    session: Session,
+    category_id: int,
+    effective_at: datetime | None = None,
+    do_commit: bool = True,
+) -> CategoryDb:
+    """Close an active category version without creating a replacement."""
+    category = (
+        session.query(CategoryDb).filter_by(id=category_id, valid_to=None).one_or_none()
+    )
+    if category is None:
+        raise ValueError(f"No active category found with id {category_id}")
+
+    action_time = _utc_datetime(effective_at)
+    _ensure_after_valid_from(category, action_time)
+    category.valid_to = action_time
+    category.last_action = "retired"
+    session.flush()
+    if do_commit:
+        session.commit()
+    return category
+
+
+def upsert_b4w(
+    session: Session, data: B4wExport, do_update=False, do_commit=True
+) -> B4wDb | None:
+    category_db = upsert_category(session, data.category)
+
+    parameters_existing = {"hash_id": data.hash_id}
+
+    parameters_new = {
+        "id_b4w": data.id,
+        "hash_id": data.hash_id,
+        "account_iban": data.account_iban,
+        "account_currency": data.account_currency.value,
+        "date_valid": data.date_valid,
+        "date_book": data.date_book,
+        "amount": data.amount_signed,
+        "amount_currency": data.amount_currency.value,
+        "text": data.reference,
+        "other_name": data.other_name,
+        "other_iban": data.other_iban,
+        "category": category_db,
+        "notes": data.notes,
+    }
+
+    return upsert(
+        session,
+        B4wDb,
+        parameters_existing,
+        parameters_new,
+        do_update=do_update,
+        do_commit=do_commit,
+    )
+
+
+def ingest_b4w(path: Path, session: Session):
+    data = reader_b4w(path)
+    for row in data:
+        upsert_b4w(session, row, do_commit=False)
+    consolidate_transactions(
+        session,
+        source="b4w",
+        StagingDb=B4wDb,
+        mapper=map_b4w_to_transaction,
+        do_commit=False,
+    )
+    session.commit()

src/ingest/comdirect.py

@@ -0,0 +1,179 @@
+import re
+from enum import Enum, auto
+from pathlib import Path
+from typing import cast
+
+from sqlalchemy.orm import Session
+
+from settings import BANK_ACCOUNTS
+from src.db_utils import upsert
+from src.ingest.transactions import (
+    consolidate_transactions,
+    map_comdirect_giro_to_transaction,
+)
+from src.models.comdirect import (
+    ComdirectCreditCard,
+    ComdirectDepot,
+    ComdirectGiro,
+    ComdirectGiroDb,
+)
+from src.models.common import Csv2Dict, CsV2DictMulti
+from src.models.settings import Account, Source
+
+PATTERN_ACCOUNT_NAME = r'^"Umsätze ([^"]+)";"Zeitraum: .*$'
+PATTERN_HEADER = r'"([^"]+)"'
+PATTERN_DATA = r'"([^"]+)"'
+
+
+class EXPECT_LINE(Enum):
+    ACCOUNT_NAME = auto()
+    BLANK = auto()
+    HEADER = auto()
+    DATA = auto()
+
+
+type ComdirectExportModel = ComdirectGiro | ComdirectDepot | ComdirectCreditCard
+
+
+SOURCE_COMDIRECT = BANK_ACCOUNTS.get("comdirect")
+assert isinstance(SOURCE_COMDIRECT, Source)
+
+SOURCE_PATH = SOURCE_COMDIRECT.source_path
+ACCOUNTS = SOURCE_COMDIRECT.accounts
+
+COMDIRECT_ACCOUNT_PARSERS = {a.name: a.model.model_validate for a in ACCOUNTS}
+
+
+def reader_comdirect(path: Path) -> dict[str, list[ComdirectExportModel]]:
+    result: dict[str, list[ComdirectExportModel]] = {}
+    raw = _reader_raw_comdirect(path)
+    for account in ACCOUNTS:
+        assert account.name in raw
+        data_raw: Csv2Dict = raw.pop(account.name)
+        data = [account.model.model_validate(row) for row in data_raw]
+        result[account.name] = cast(list[ComdirectExportModel], data)
+    assert not raw
+    return result
+
+
+def _open_and_readlines(path: Path, encoding: str) -> list[str]:
+    with path.open("r", encoding=encoding) as fid:
+        lines = fid.readlines()
+    return lines
+
+
+def _reader_raw_comdirect(path: Path) -> CsV2DictMulti:
+
+    try:
+        lines = _open_and_readlines(path, encoding="utf-8")
+    except UnicodeDecodeError:
+        lines = _open_and_readlines(path, encoding="latin-1")
+
+    expect_next = EXPECT_LINE.ACCOUNT_NAME
+    account_name: str | None = None
+    header: list[str] = []
+    result: CsV2DictMulti = {}
+    # Comdirect groups "new" transactions (marked with "neu") under a header
+    # line that carries only their Buchungstag; remember it until the next
+    # transaction row for the same account.
+    pending_book_date: dict[str, str] = {}
+    for line in lines:
+        if expect_next == EXPECT_LINE.ACCOUNT_NAME:
+            matches = re.findall(PATTERN_ACCOUNT_NAME, line)
+            if matches:
+                account_name = matches[0]
+                result[account_name] = []
+                expect_next = EXPECT_LINE.BLANK
+        elif expect_next == EXPECT_LINE.BLANK:
+            if line == "\n":
+                expect_next = EXPECT_LINE.HEADER
+        elif expect_next == EXPECT_LINE.HEADER:
+            header = re.findall(PATTERN_HEADER, line)
+            if header:
+                assert account_name is not None
+                result[account_name] = []
+                expect_next = EXPECT_LINE.DATA
+        elif expect_next == EXPECT_LINE.DATA:
+            data = re.findall(PATTERN_DATA, line)
+            if not data:
+                expect_next = EXPECT_LINE.ACCOUNT_NAME
+            elif len(data) == 1:
+                # Group header line (single Buchungstag for the "neu" rows below).
+                assert account_name is not None
+                pending_book_date[account_name] = data[0]
+            else:
+                assert account_name is not None
+                row = {column: value for column, value in zip(header, data)}
+                if data[0] == "neu" and account_name in pending_book_date:
+                    row["Buchungstag"] = pending_book_date.pop(account_name)
+                result[account_name].append(row)
+        else:
+            expect_next = EXPECT_LINE.ACCOUNT_NAME
+    return result
+
+
+def upsert_comdirect_giro(
+    session: Session,
+    data: ComdirectGiro,
+    account_iban: str,
+    account_currency: str,
+    do_update=False,
+    do_commit=True,
+) -> ComdirectGiroDb | None:
+    parameters_existing = {"hash_id": data.hash_id}
+
+    if not data.date_val:
+        return None
+
+    parameters_new = {
+        "hash_id": data.hash_id,
+        "account_iban": account_iban,
+        "account_currency": account_currency,
+        "amount_currency": account_currency,
+        "date_valid": data.date_val,
+        "amount": data.amount_eur,
+        "date_book": data.date_book,
+        "type": data.type,
+        "text": data.text,
+    }
+
+    return upsert(
+        session,
+        ComdirectGiroDb,
+        parameters_existing,
+        parameters_new,
+        do_update=do_update,
+        do_commit=do_commit,
+    )
+
+
+def ingest_comdirect(
+    session: Session, path: Path, account_iban: str, account_currency: str
+):
+    assert SOURCE_COMDIRECT
+    data_collection = reader_comdirect(path)
+    for account_name, data in data_collection.items():
+        account = SOURCE_COMDIRECT.get_account(account_name)
+        assert isinstance(account, Account)
+        if account_name != "Girokonto":
+            # Aktuell speist nur das Girokonto die Tabelle `comdirect_giro`
+            # (Kreditkarte, Tagesgeld und Depot sind vorerst ausgeklammert).
+            continue
+        for row in data:
+            data_validated = account.model.model_validate(row)
+            assert isinstance(data_validated, ComdirectGiro)
+            upsert_comdirect_giro(
+                session=session,
+                data=data_validated,
+                account_iban=account_iban,
+                account_currency=account_currency,
+                do_commit=False,
+            )
+    consolidate_transactions(
+        session,
+        source="comdirect_giro",
+        StagingDb=ComdirectGiroDb,
+        mapper=map_comdirect_giro_to_transaction,
+        do_commit=False,
+    )
+    session.commit()

src/ingest/common.py

@@ -0,0 +1,7 @@
+import csv
+from pathlib import Path
+
+
+def _reader_raw(path: Path):
+    with path.open() as fid:
+        return list(csv.DictReader(fid))

src/ingest/transactions.py

@@ -0,0 +1,116 @@
+from collections.abc import Callable
+
+from sqlalchemy import select
+from sqlalchemy.dialects.sqlite import insert as sqlite_insert
+from sqlalchemy.orm import Session
+
+from src.models.b4w import B4wDb
+from src.models.category import Category, CategoryDb
+from src.models.comdirect import ComdirectGiroDb
+from src.models.common import BaseModelDb
+from src.models.transactions import Transaction, TransactionDb
+
+
+def _category_from_db(category_db: CategoryDb | None) -> Category | None:
+    if category_db is None:
+        return None
+    return Category(
+        name=category_db.name,
+        parent=_category_from_db(category_db.parent),
+    )
+
+
+def map_b4w_to_transaction(row: B4wDb) -> Transaction:
+    """Project one staging row of ``import_b4w`` onto a canonical Transaction."""
+    return Transaction(
+        source="b4w",
+        source_row_id=row.id,
+        account_iban=row.account_iban,
+        account_currency=row.account_currency,
+        date_valid=row.date_valid,
+        date_book=row.date_book,
+        amount=row.amount,
+        amount_currency=row.amount_currency,
+        text=row.text,
+        other_name=row.other_name,
+        other_iban=row.other_iban,
+        category=_category_from_db(row.category),
+    )
+
+
+def map_comdirect_giro_to_transaction(row: ComdirectGiroDb) -> Transaction:
+    """Project one staging row of ``comdirect_giro`` onto a canonical Transaction."""
+    return Transaction(
+        source="comdirect_giro",
+        source_row_id=row.id,
+        account_iban=row.account_iban,
+        account_currency=row.account_currency,
+        date_valid=row.date_valid,
+        date_book=row.date_book,
+        amount=row.amount,
+        amount_currency=row.amount_currency,
+        text=row.text,
+    )
+
+
+def upsert_transaction(
+    session: Session,
+    transaction: Transaction,
+    *,
+    category_db: CategoryDb | None = None,
+    do_commit: bool = True,
+) -> None:
+    """Insert one canonical transaction, ignoring duplicates on ``hash_id``.
+
+    Uses a DB-native ``INSERT OR IGNORE`` (SQLite). For PostgreSQL, swap for
+    ``postgresql_insert(TransactionDb).values(...).on_conflict_do_nothing(
+    constraint="uq_transactions_hash")``.
+    """
+    parameters = {
+        "hash_id": transaction.hash_id,
+        "source": transaction.source,
+        "source_row_id": transaction.source_row_id,
+        "account_iban": transaction.account_iban,
+        "account_currency": transaction.account_currency,
+        "date_valid": transaction.date_valid,
+        "date_book": transaction.date_book,
+        "amount": transaction.amount,
+        "amount_currency": transaction.amount_currency,
+        "text": transaction.text,
+        "other_name": transaction.other_name,
+        "other_iban": transaction.other_iban,
+        "category_id": category_db.id if category_db is not None else None,
+    }
+    stmt = sqlite_insert(TransactionDb).values(parameters)
+    _ = session.execute(stmt.prefix_with("OR IGNORE"))
+    if do_commit:
+        session.commit()
+
+
+def consolidate_transactions[StagingDbT: BaseModelDb](
+    session: Session,
+    source: str,
+    StagingDb: type[StagingDbT],
+    mapper: Callable[[StagingDbT], Transaction],
+    do_commit: bool = True,
+) -> None:
+    """Project staging rows of one source into the unified ``transactions`` table.
+
+    Idempotent: rows whose business-key hash already exists for this source
+    are skipped, and ``INSERT OR IGNORE`` protects against in-batch duplicates.
+    """
+    existing_hashes = set(
+        session.scalars(select(TransactionDb.hash_id).filter_by(source=source))
+    )
+    for staging_row in session.query(StagingDb).all():
+        transaction = mapper(staging_row)
+        if transaction.hash_id in existing_hashes:
+            continue
+        upsert_transaction(
+            session,
+            transaction,
+            category_db=getattr(staging_row, "category", None),
+            do_commit=False,
+        )
+    if do_commit:
+        session.commit()

src/main.py

@@ -1,31 +1,42 @@
-#!/bin/python
-
 import argparse
 from pathlib import Path
 
-from src.reader import reader_b4w, reader_raw
-from src.helper_db import upsert_b4w
 from src.db import get_session
-
+from src.ingest.b4w import ingest_b4w
-
+from src.ingest.comdirect import ingest_comdirect
-def ingest_b4w(path: Path):
+from src.models.settings import Account
-    data = reader_b4w(path)
-    with get_session() as session:
-        for row in data:
-            upsert_b4w(session, row, do_commit=False)
-        session.commit()
 
 
 def main():
     parser = argparse.ArgumentParser(
         description="Eine App um den Überblick über Finanzen zu behalten"
     )
-    parser.add_argument("input", help="Pfad einer einzulesenden Umsatzdatei (CSV)")
+    parser.add_argument(
+        "--input_b4w", help="Pfad einer einzulesenden Umsatzdatei (CSV)"
+    )
+    parser.add_argument(
+        "--input_comdirect", help="Pfad einer einzulesenden Umsatzdatei (CSV)"
+    )
     args = parser.parse_args()
 
-    path = Path(args.input)
+    if args.input_b4w:
+        with get_session() as session:
+            ingest_b4w(Path(args.input_b4w), session)
+    if args.input_comdirect:
+        import settings
+
+        giro_account = settings.BANK_ACCOUNTS["comdirect"].get_account("Girokonto")
+        assert isinstance(giro_account, Account)
+        with get_session() as session:
+            ingest_comdirect(
+                session,
+                Path(args.input_comdirect),
+                account_iban=giro_account.iban or "",
+                account_currency=(
+                    giro_account.currency.value if giro_account.currency else ""
+                ),
+            )
 
-    ingest_b4w(path)
 
 if __name__ == "__main__":
     main()

src/models.py

@@ -1,92 +0,0 @@
-#!/bin/python
-
-from datetime import date
-from decimal import Decimal
-from enum import Enum
-
-from pydantic import BaseModel, Field, ValidationError, field_validator
-
-IBAN_PATTERN = r"^[A-Z]{2}\d{2}[A-Z0-9]{11,30}$"
-
-
-class Currency(str, Enum):
-    EUR = "EUR"
-    USD = "USD"
-    GBP = "GBP"
-    CHF = "CHF"
-
-    def __str__(self):
-        return self.value
-
-    def __repr__(self):
-        return f"Currency.{self.name}"
-
-
-class Sign(str, Enum):
-    DEBIT = "DBIT"
-    CREDIT = "CRDT"
-
-    def __str__(self):
-        return self.value
-
-    def __repr__(self):
-        return f"Sign.{self.name}"
-
-    def to_sign(self) -> int:
-        return -1 if self is Sign.DEBIT else 1
-
-
-class B4wExport(BaseModel):
-    id: int = Field(alias="Id1", description="internal B4w ID")
-    account_iban: str = Field(alias="OwnrAcctIBAN", pattern=IBAN_PATTERN)
-    account_currency: Currency = Field(alias="OwnrAcctCcy")
-    date_valid: date = Field(alias="ValDt")
-    date_book: date = Field(alias="BookgDt")
-    amount: Decimal = Field(alias="Amt")
-    amount_currency: Currency = Field(alias="AmtCcy")
-    sign: Sign = Field(alias="CdtDbtInd")
-    reference: str = Field(alias="RmtInf")
-    other_name: str = Field(alias="RmtdNm")
-    other_iban: str = Field(alias="RmtdAcctIBAN")
-    category: Category | None = Field(alias="Category")
-    notes: str = Field(alias="Notes")
-
-    @property
-    def amount_signed(self) -> Decimal:
-        return self.amount * self.sign.to_sign()
-
-    @field_validator("category", mode="before")
-    @classmethod
-    def category_str_is_parsable(cls, category_str: str) -> Category | None:
-        category = Category.from_str(category_str)
-        assert category
-        category_str_2 = category.to_str()
-        if not category_str == category_str_2:
-            raise ValidationError(f"Category string cannot be parsed: {category_str}")
-        return category
-
-
-class Category(BaseModel):
-    name: str = Field(pattern=r"[^:\r\n]+")
-    parent: Category | None = None
-
-    @classmethod
-    def from_str(cls, s: str) -> Category | None:
-        if not s:
-            return
-        components = s.split(":")
-        name = components[-1]
-        rest = ":".join(components[:-1])
-        return cls(name=name, parent=cls.from_str(rest))
-
-    def to_str(self) -> str | None:
-        if not self.parent:
-            return self.name
-        else:
-            return f"{self.parent.to_str()}:{self.name}"
-
-    def __str__(self):
-        return self.to_str()
-
-    def __repr__(self):
-        return f'Category.from_str("{self.__str__()}")'

src/models/__init__.py

@@ -0,0 +1,47 @@
+from importlib import import_module
+from typing import TYPE_CHECKING, Any
+
+_EXPORTS = {
+    "B4wExport": ".b4w",
+    "Category": ".category",
+    "CategoryBudget": ".category",
+    "CategoryBudgetDb": ".category",
+    "CategoryDb": ".category",
+    "ComdirectCreditCard": ".comdirect",
+    "ComdirectDepot": ".comdirect",
+    "ComdirectGiro": ".comdirect",
+    "Account": ".settings",
+    "Source": ".settings",
+    "Transaction": ".transactions",
+    "TransactionDb": ".transactions",
+}
+__all__ = list(_EXPORTS)
+
+
+def __getattr__(name: str) -> Any:
+    module_name = _EXPORTS.get(name)
+    if module_name is None:
+        raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
+
+    value = getattr(import_module(module_name, __name__), name)
+    globals()[name] = value
+    return value
+
+
+def __dir__() -> list[str]:
+    return sorted([*globals(), *__all__])
+
+
+if TYPE_CHECKING:
+    from src.models.b4w import B4wExport as B4wExport
+    from src.models.category import Category as Category
+    from src.models.category import CategoryBudget as CategoryBudget
+    from src.models.category import CategoryBudgetDb as CategoryBudgetDb
+    from src.models.category import CategoryDb as CategoryDb
+    from src.models.comdirect import ComdirectCreditCard as ComdirectCreditCard
+    from src.models.comdirect import ComdirectDepot as ComdirectDepot
+    from src.models.comdirect import ComdirectGiro as ComdirectGiro
+    from src.models.settings import Account as Account
+    from src.models.settings import Source as Source
+    from src.models.transactions import Transaction as Transaction
+    from src.models.transactions import TransactionDb as TransactionDb

src/models/b4w.py

@@ -0,0 +1,110 @@
+from datetime import date
+from decimal import Decimal
+
+from pydantic import Field, computed_field, field_validator
+from sqlalchemy import (
+    Date,
+    ForeignKey,
+    Integer,
+    String,
+)
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from src.constants import IBAN_PATTERN, Currency
+from src.models.category import Category, CategoryDb
+from src.models.common import (
+    ExportBaseModel,
+    IngestdbBase,
+    Sign,
+    date2str,
+    hashify,
+)
+
+__all__ = ["B4wDb", "B4wExport", "Category", "CategoryDb"]
+
+
+class B4wExport(ExportBaseModel):
+    id: int = Field(alias="Id1", description="internal B4w ID")
+    account_iban: str = Field(alias="OwnrAcctIBAN", pattern=IBAN_PATTERN)
+    account_currency: Currency = Field(alias="OwnrAcctCcy")
+    date_valid: date = Field(alias="ValDt")
+    date_book: date = Field(alias="BookgDt")
+    amount: Decimal = Field(alias="Amt", gt=0, decimal_places=2)
+    amount_currency: Currency = Field(alias="AmtCcy")
+    sign: Sign = Field(alias="CdtDbtInd")
+    reference: str = Field(alias="RmtInf")
+    other_name: str = Field(alias="RmtdNm")
+    other_iban: str | None = Field(alias="RmtdAcctIBAN", pattern=IBAN_PATTERN)
+    category: Category | None = Field(
+        alias="Category",
+        examples=[
+            "Freizeit",
+            "Beruf:Gehalt:super Firma",
+            "Lebenshaltung:Lebensmitteleinkäuft",
+            "",
+        ],
+    )
+    notes: str = Field(alias="Notes")
+
+    def parameters_to_dict(self) -> dict[str, str]:
+        return {
+            "Id1": f"{self.id}",
+            "OwnrAcctIBAN": f"{self.account_iban!s}",
+            "OwnrAcctCcy": f"{self.account_currency!s}",
+            "ValDt": date2str(self.date_valid),
+            "BookgDt": date2str(self.date_book),
+            "Amt": f"{self.amount!s}",
+            "AmtCcy": f"{self.amount_currency!s}",
+            "CdtDbtInd": f"{self.sign!s}",
+            "RmtInf": f"{self.reference}",
+            "RmtdNm": f"{self.other_name}",
+            "RmtdAcctIBAN": f"{self.other_iban or ''}",
+            "Category": f"{self.category.to_str() if self.category else ''}",
+            "Notes": f"{self.notes}",
+        }
+
+    @computed_field  # type: ignore[prop-decorator]
+    @property
+    def hash_id(self) -> str:
+        return hashify(self.id)
+
+    @property
+    def amount_signed(self) -> Decimal:
+        return self.amount * self.sign.to_sign()
+
+    @field_validator("other_iban", mode="before")
+    @classmethod
+    def other_iban_blank_is_none(cls, iban_in: str | None) -> str | None:
+        if iban_in is None or (isinstance(iban_in, str) and not iban_in.strip()):
+            return None
+        return iban_in
+
+    @field_validator("category", mode="before")
+    @classmethod
+    def category_str_is_parsable(
+        cls, category_in: str | Category | None
+    ) -> Category | None:
+        if category_in is None or category_in == "":
+            return None
+        if isinstance(category_in, Category):
+            return category_in
+        category = Category.from_str(category_in)
+        if category is None or category.to_str() != category_in:
+            raise ValueError(f"Category string cannot be parsed: {category_in!r}")
+        return category
+
+
+class B4wDb(IngestdbBase):
+    __tablename__ = "import_b4w"
+
+    id_b4w: Mapped[int] = mapped_column(Integer, nullable=False, unique=True)
+    date_book: Mapped[date | None] = mapped_column(Date, nullable=True)
+    other_name: Mapped[str | None] = mapped_column(String, nullable=True)
+    other_iban: Mapped[str | None] = mapped_column(String, nullable=True)
+    category_id: Mapped[int | None] = mapped_column(
+        ForeignKey("category.id"), nullable=True
+    )
+    notes: Mapped[str | None] = mapped_column(String, nullable=True)
+
+    # relationship
+    category = relationship("CategoryDb")

src/models/category.py

@@ -0,0 +1,234 @@
+from __future__ import annotations
+
+from datetime import UTC, date, datetime, timedelta
+from decimal import Decimal
+from typing import Self
+
+from pydantic import BaseModel, Field, computed_field, model_validator
+from sqlalchemy import (
+    Date,
+    DateTime,
+    ForeignKey,
+    Index,
+    Numeric,
+    String,
+    TypeDecorator,
+    text,
+)
+from sqlalchemy.orm import Mapped, Session, mapped_column, relationship
+
+from src.db_utils import upsert
+from src.models.common import AmountPos, BaseModelDb, ExportBaseModel, hashify
+
+
+class UTCDateTime(TypeDecorator[datetime]):
+    """Store UTC timestamps and return timezone-aware UTC values on every dialect."""
+
+    impl = DateTime
+    cache_ok = True
+
+    def load_dialect_impl(self, dialect):
+        return dialect.type_descriptor(DateTime(timezone=True))
+
+    def process_bind_param(self, value: datetime | None, dialect):
+        if value is None:
+            return None
+        if value.tzinfo is None or value.utcoffset() is None:
+            return value.replace(tzinfo=UTC)
+        return value.astimezone(UTC)
+
+    def process_result_value(self, value: datetime | None, dialect):
+        if value is None:
+            return None
+        if value.tzinfo is None or value.utcoffset() is None:
+            return value.replace(tzinfo=UTC)
+        return value.astimezone(UTC)
+
+
+class Category(ExportBaseModel):
+    name: str = Field(pattern=r"[^:\r\n]+")
+    parent: Category | None = None
+
+    @computed_field  # type: ignore[prop-decorator]
+    @property
+    def hash_id(self) -> str:
+        return hashify(self.name, self.parent)
+
+    @classmethod
+    def from_str(cls, s: str) -> Category | None:
+        if not s:
+            return None
+        components = s.split(":")
+        name = components[-1]
+        rest = ":".join(components[:-1])
+        return cls(name=name, parent=cls.from_str(rest))
+
+    def to_str(self) -> str | None:
+        if not self.parent:
+            return self.name
+        else:
+            return f"{self.parent.to_str()}:{self.name}"
+
+    def __str__(self) -> str:
+        return self.to_str() or ""
+
+    def __repr__(self):
+        return f'Category.from_str("{self.__str__()}")'
+
+    def get_budget(self, date_valid: date | None) -> float:
+        # TODO
+        return 0.0
+
+
+class CategoryDb(BaseModelDb):
+    __tablename__ = "category"
+    __table_args__ = (
+        Index(
+            "uq_category_active_name_parent",
+            "name",
+            "parent_id",
+            unique=True,
+            sqlite_where=text("valid_to IS NULL AND parent_id IS NOT NULL"),
+            postgresql_where=text("valid_to IS NULL AND parent_id IS NOT NULL"),
+        ),
+        Index(
+            "uq_category_active_root_name",
+            "name",
+            unique=True,
+            sqlite_where=text("valid_to IS NULL AND parent_id IS NULL"),
+            postgresql_where=text("valid_to IS NULL AND parent_id IS NULL"),
+        ),
+    )
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    name: Mapped[str] = mapped_column(String, nullable=False)
+    parent_id: Mapped[int | None] = mapped_column(
+        ForeignKey("category.id"), nullable=True
+    )
+    valid_from: Mapped[datetime | None] = mapped_column(
+        UTCDateTime(),
+        nullable=True,
+        info={
+            "description": "UTC start of validity; NULL means valid since the indefinite past."
+        },
+    )
+    valid_to: Mapped[datetime | None] = mapped_column(
+        UTCDateTime(),
+        nullable=True,
+        info={
+            "description": "UTC end of validity; NULL means the version is currently valid."
+        },
+    )
+    last_action: Mapped[str] = mapped_column(
+        String,
+        nullable=False,
+        default="created",
+        server_default="created",
+        info={
+            "description": "Most recent lifecycle action recorded for this category version."
+        },
+    )
+
+    # Relationships
+    parent = relationship(
+        "CategoryDb", remote_side="CategoryDb.id", back_populates="children"
+    )
+    children = relationship("CategoryDb", back_populates="parent")
+    budgets: Mapped[list[CategoryBudgetDb]] = relationship(back_populates="category")
+
+
+def upsert_category(
+    session: Session, category: Category | None, do_commit: bool = True
+) -> CategoryDb | None:
+    if category is None:
+        return None
+
+    parent = upsert_category(session, category.parent, do_commit=False)
+    parameters = {"name": category.name, "parent": parent}
+    matching_rows = session.query(CategoryDb).filter_by(
+        name=category.name, parent_id=parent.id if parent else None
+    )
+    active = matching_rows.filter(CategoryDb.valid_to.is_(None)).one_or_none()
+    if active is not None:
+        return active
+
+    historical = (
+        matching_rows.filter(CategoryDb.valid_to.is_not(None))
+        .order_by(CategoryDb.valid_to.desc())
+        .first()
+    )
+    valid_from = None
+    last_action = "created"
+    if historical is not None:
+        valid_from = datetime.now(UTC)
+        if historical.valid_to is not None:
+            previous_valid_to = historical.valid_to
+            if (
+                previous_valid_to.tzinfo is None
+                or previous_valid_to.utcoffset() is None
+            ):
+                previous_valid_to = previous_valid_to.replace(tzinfo=UTC)
+            else:
+                previous_valid_to = previous_valid_to.astimezone(UTC)
+            valid_from = max(valid_from, previous_valid_to + timedelta(microseconds=1))
+        last_action = "changed"
+
+    parameters_new = {
+        **parameters,
+        "valid_from": valid_from,
+        "valid_to": None,
+        "last_action": last_action,
+    }
+    return upsert(
+        session,
+        CategoryDb,
+        {**parameters, "valid_to": None},
+        parameters_new,
+        do_update=False,
+        do_commit=do_commit,
+    )
+
+
+class CategoryBudget(BaseModel):
+    category: Category
+    amount_eur: AmountPos
+    valid_from: date | None = Field(
+        default=None, description="Start of validity. None means unbounded"
+    )
+    valid_to: date | None = Field(
+        default=None, description="End of validity. None means unbounded"
+    )
+
+    @model_validator(mode="after")
+    def validate_date_range(self) -> Self:
+        if (
+            self.valid_from is not None
+            and self.valid_to is not None
+            and self.valid_from > self.valid_to
+        ):
+            raise ValueError(
+                f"`valid_from` ({self.valid_from}) and valid_to ({self.valid_to}) are nor in order"
+            )
+        return self
+
+
+class CategoryBudgetDb(BaseModelDb):
+    """Budget amount for a category, optionally bounded to a time window.
+
+    Satellite table to ``category``: one category may have several budgets
+    (e.g. one per month). ``valid_from``/``valid_to`` are nullable; ``None``
+    means unbounded on that side.
+    """
+
+    __tablename__ = "category_budget"
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    category_id: Mapped[int] = mapped_column(
+        ForeignKey("category.id"), nullable=False, index=True
+    )
+    amount_eur: Mapped[Decimal] = mapped_column(Numeric(12, 2), nullable=False)
+    valid_from: Mapped[date | None] = mapped_column(Date, nullable=True, default=None)
+    valid_to: Mapped[date | None] = mapped_column(Date, nullable=True, default=None)
+
+    # relationship
+    category = relationship("CategoryDb", back_populates="budgets")

src/models/category_tree.py

@@ -0,0 +1,85 @@
+from datetime import date
+
+from pydantic import BaseModel, computed_field
+
+from src.models.category import Category
+from src.models.transactions import Transaction
+
+
+class CategoryTree(BaseModel):
+    category: Category | None
+    sub_categories: list[CategoryTree] | None = None
+    transactions: list[Transaction] | None = None
+
+    @computed_field  # type: ignore[prop-decorator]
+    @property
+    def total_amount(self) -> float:
+        result = 0.0
+        if self.transactions:
+            result += sum(
+                float(transaction.amount) for transaction in self.transactions
+            )
+        if self.sub_categories:
+            result += sum(
+                float(sub_category.total_amount) for sub_category in self.sub_categories
+            )
+        return result
+
+    def total_budget(self, date_valid: date) -> float:
+        result = 0.0
+        if self.category is None:
+            return result
+        result += self.category.get_budget(date_valid)
+        if self.sub_categories:
+            result += sum(
+                sub_category.total_budget(date_valid)
+                for sub_category in self.sub_categories
+            )
+        return result
+
+    def __add__(self, other: CategoryTree):
+        if self.category != other.category:
+            return
+
+        sub_trees = []
+        seen = []
+        for sub_tree_1 in self.sub_categories or []:
+            new = sub_tree_1
+            for sub_tree_2 in other.sub_categories or []:
+                if sub_tree_1.category == sub_tree_2.category:
+                    new += sub_tree_2
+                    seen.append(sub_tree_2)
+                    break
+            sub_trees.append(new)
+        sub_trees += [
+            sub_tree
+            for sub_tree in (other.sub_categories or [])
+            if sub_tree not in seen
+        ]
+
+        transactions = ((self.transactions or []) + (other.transactions or [])) or None
+
+        return CategoryTree(
+            category=self.category,
+            sub_categories=list(sub_trees),
+            transactions=transactions,
+        )
+
+
+def build_category_tree(transactions: list[Transaction]) -> list[CategoryTree]:
+    results: dict[str, CategoryTree] = {}
+    for branch in map(_transaction_to_category_branch, transactions):
+        key = str(branch.category) if branch.category else ""
+        results[key] = (results[key] + branch) if key in results else branch
+    return list(results.values())
+
+
+def _transaction_to_category_branch(transaction: Transaction) -> CategoryTree:
+    category = transaction.category
+    result = CategoryTree(category=category, transactions=[transaction])
+    if not category:
+        return result
+    while category.parent is not None:
+        category = category.parent
+        result = CategoryTree(category=category, sub_categories=[result])
+    return result

src/models/comdirect.py

@@ -0,0 +1,157 @@
+from datetime import date
+from decimal import Decimal
+
+from pydantic import ConfigDict, Field, computed_field, field_validator
+from sqlalchemy import Date, String
+from sqlalchemy.orm import Mapped, mapped_column
+
+from src.models.common import (
+    ExportBaseModel,
+    IngestdbBase,
+    _parse_date_german,
+    _parse_decimal_german,
+    date2str,
+    decimal2str,
+    hashify,
+)
+
+
+class ComdirectBase(ExportBaseModel):
+    model_config = ConfigDict(populate_by_name=True)
+    date_val: date | None = Field(
+        alias="Wertstellung (Valuta)", examples=["07.09.2026"]
+    )
+    amount_eur: Decimal = Field(alias="Umsatz in EUR", examples=["32,43"])
+
+    @field_validator("date_val", mode="before")
+    @classmethod
+    def parse_date_val(cls, date_str: str | None) -> date | None:
+        if date_str is None:
+            return None
+        return _parse_date_german(date_str)
+
+    @field_validator("amount_eur", mode="before")
+    @classmethod
+    def parse_amount(cls, decimal_str: str) -> Decimal:
+        return _parse_decimal_german(decimal_str)
+
+    @classmethod
+    def _date2str(cls, date_value: date | None) -> str:
+        return date2str(date_value, default="--", date_format="%d.%m.%Y")
+
+    def parameters_to_dict(self, by_name=True) -> dict[str, str]:
+        return {
+            "date_val" if by_name else "Wertstellung (Valuta)": self._date2str(
+                self.date_val
+            ),
+            "amount_eur" if by_name else "Umsatz in EUR": decimal2str(self.amount_eur),
+        }
+
+    def get_orig_headers(self, sep: str = ";", bracket: str = '"'):
+        return sep.join(
+            f"{bracket}{txt}{bracket}" for txt in self.parameters_to_dict(by_name=False)
+        )
+
+    def get_orig_row(self, sep: str = ";", bracket: str = '"'):
+        return sep.join(
+            f"{bracket}{txt}{bracket}"
+            for txt in self.parameters_to_dict(by_name=False).values()
+        )
+
+
+class ComdirectGiro(ComdirectBase):
+    # # Fields from parents:
+    # date_val
+    # amount_eur
+    date_book: date | None = Field(alias="Buchungstag", examples=["07.09.2026"])
+    type: str = Field(
+        alias="Vorgang", examples=["Lastschrift / Belastung", "Kartenumsatz"]
+    )
+    text: str = Field(alias="Buchungstext")
+
+    @computed_field  # type: ignore[prop-decorator]
+    @property
+    def hash_id(self) -> str:
+        return hashify(self.date_val, self.date_book, self.text)
+
+    @field_validator("date_book", mode="before")
+    @classmethod
+    def parse_date_book(cls, date_str: str) -> date | None:
+        return _parse_date_german(date_str)
+
+    def parameters_to_dict(self, by_name: bool = True) -> dict[str, str]:
+        parameters = dict(**super().parameters_to_dict(by_name=by_name))
+        parameters.update(
+            {
+                "date_book" if by_name else "Buchungstag": self._date2str(
+                    self.date_book
+                ),
+                "type" if by_name else "Vorgang": self.type,
+                "text" if by_name else "Buchungstext": self.text,
+            }
+        )
+        return parameters
+
+
+class ComdirectCreditCard(ComdirectGiro):
+    # # Fields from parents:
+    date_book: date | None = Field(alias="Buchungstag", examples=["07.09.2026"])
+    date_val: date | None = Field(alias="Umsatztag", default=None)
+    type: str = Field(
+        alias="Vorgang",
+        examples=["Lastschrift / Belastung", "Kartenumsatz"],
+        default="",
+    )
+    reference: str = Field(alias="Referenz", default="")
+    text: str = Field(alias="Buchungstext", default="")
+
+    def parameters_to_dict(self, by_name: bool = True) -> dict[str, str]:
+        parameters = dict(**super().parameters_to_dict(by_name=by_name))
+        parameters.update(
+            {
+                "Umsatztag": self._date2str(self.date_val),
+                "Referenz": self.reference,
+            }
+        )
+        return parameters
+
+
+class ComdirectDepot(ComdirectBase):
+    # # Fields from parents:
+    # amount_eur
+    date_val: date | None = Field(alias="Geschäftstag")
+    num: Decimal = Field(alias="Stück / Nom.")
+    name: str = Field(alias="Bezeichnung")
+    wkn: str = Field(alias="WKN")
+    currency: str = Field(alias="Währung")
+    spot_price: Decimal = Field(alias="Ausführungskurs")
+
+    @field_validator("num", "spot_price", mode="before")
+    @classmethod
+    def parse_decimals(cls, decimal_in: str) -> Decimal:
+        return _parse_decimal_german(decimal_in)
+
+    def parameters_to_dict(self, by_name: bool = True) -> dict[str, str]:
+        parameters = dict(**super().parameters_to_dict(by_name=by_name))
+        parameters.update(
+            {
+                "Geschäftstag": self._date2str(self.date_val),
+                "Stück / Nom.": decimal2str(self.num),
+                "Bezeichnung": self.name,
+                "WKN": self.wkn,
+                "Währung": self.currency,
+                "Ausführungskurs": decimal2str(self.spot_price),
+            }
+        )
+        return parameters
+
+
+class ComdirectBaseDb(IngestdbBase):
+    __abstract__ = True
+
+
+class ComdirectGiroDb(ComdirectBaseDb):
+    __tablename__ = "comdirect_giro"
+
+    type: Mapped[str | None] = mapped_column(String, nullable=True)
+    date_book: Mapped[date | None] = mapped_column(Date, nullable=True)

src/models/common.py

@@ -0,0 +1,104 @@
+import hashlib
+from datetime import date
+from decimal import Decimal
+from enum import Enum
+from typing import Annotated
+
+from pydantic import BaseModel, Field
+from sqlalchemy import Date, Numeric, String
+from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
+
+
+def hashify(*args):
+    raw = "".join(str(args))
+    return hashlib.sha256(raw.encode()).hexdigest()
+
+
+class Sign(str, Enum):
+    DEBIT = "DBIT"
+    CREDIT = "CRDT"
+
+    def __str__(self):
+        return self.value
+
+    def __repr__(self):
+        return f"Sign.{self.name}"
+
+    def to_sign(self) -> int:
+        return -1 if self is Sign.DEBIT else 1
+
+
+def _parse_date_german(date_str: str) -> date | None:
+    if date_str in ["offen", "neu", "--"]:
+        return None
+    day, month, year = list(map(int, date_str.split(".")))
+    return date(day=day, month=month, year=year)
+
+
+def date2str(value: date | None, default="--", date_format="%Y-%m-%d") -> str:
+    if value:
+        return value.strftime(date_format)
+    return default
+
+
+type AmountPos = Annotated[Decimal, Field(decimal_places=2, gt=0)]
+type Amount = Annotated[Decimal, Field(decimal_places=2)]
+
+
+def _parse_decimal_german(decimal_str: str) -> Amount:
+    return Decimal(decimal_str.replace(".", "").replace(",", "."))
+
+
+def decimal2str(value: Amount) -> str:
+    value = Decimal(f"{value:.2f}")
+    int_part, _, frac = str(value).partition(".")
+    groups: list[str] = []
+    while len(int_part) > 3:
+        groups.insert(0, int_part[-3:])
+        int_part = int_part[:-3]
+    groups.insert(0, int_part or "0")
+    return f"{'.'.join(groups)},{frac or '00'}"
+
+
+type Csv2DictRow = dict[str, str]
+type Csv2Dict = list[Csv2DictRow]
+type CsV2DictMulti = dict[str, Csv2Dict]
+
+
+class ExportBaseModel(BaseModel):
+
+    @classmethod
+    def _my_name(cls):
+        return cls.__name__
+
+    def parameters_to_dict(self) -> dict[str, str]:
+        return {}
+
+    def parameters_to_str(self):
+        parameters = ", ".join(
+            f"{key}='{value}'" for key, value in self.parameters_to_dict().items()
+        )
+        return parameters
+
+    def __repr__(self):
+        return f"{self._my_name()}({self.parameters_to_str()})"
+
+    def __str__(self):
+        return f"{self._my_name()}({self.parameters_to_str()})"
+
+
+class BaseModelDb(DeclarativeBase):
+    pass
+
+
+class IngestdbBase(BaseModelDb):
+    __abstract__ = True
+
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    hash_id: Mapped[str] = mapped_column(String, nullable=False)
+    account_iban: Mapped[str] = mapped_column(String, nullable=False)
+    account_currency: Mapped[str] = mapped_column(String(3), nullable=False)
+    date_valid: Mapped[date] = mapped_column(Date, nullable=False)
+    amount: Mapped[Decimal] = mapped_column(Numeric(12, 2), nullable=False)
+    amount_currency: Mapped[str] = mapped_column(String(3), nullable=False)
+    text: Mapped[str | None] = mapped_column(String, nullable=True)

src/models/settings.py

@@ -0,0 +1,26 @@
+from pathlib import Path
+
+from pydantic import BaseModel, Field
+
+from src.constants import IBAN_PATTERN, Currency
+from src.models.b4w import B4wExport
+from src.models.comdirect import ComdirectCreditCard, ComdirectDepot, ComdirectGiro
+
+
+class Account(BaseModel):
+    name: str
+    model: type[B4wExport | ComdirectGiro | ComdirectCreditCard | ComdirectDepot]
+    iban: str | None = Field(pattern=IBAN_PATTERN, default=None)
+    currency: Currency | None = None
+
+
+class Source(BaseModel):
+    name: str
+    source_path: Path
+    accounts: list[Account]
+
+    def get_account_names(self) -> list[str]:
+        return [a.name for a in self.accounts]
+
+    def get_account(self, name: str) -> Account | None:
+        return next((a for a in self.accounts if a.name == name), None)

src/models/transactions.py

@@ -0,0 +1,78 @@
+from datetime import date
+
+from pydantic import Field, computed_field
+from sqlalchemy import Date, ForeignKey, Index, Integer, String, UniqueConstraint
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from src.models.category import Category
+from src.models.common import Amount, ExportBaseModel, IngestdbBase, date2str, hashify
+
+
+class Transaction(ExportBaseModel):
+    """Canonical, source-agnostic representation of a bank transaction.
+
+    Both input sources (b4w, comdirect giro) are projected into this model.
+    The deduplication key is a business-key hash of the transaction
+    attributes, so re-importing an export is idempotent even if
+    source-internal ids change between exports.
+    """
+
+    source: str = Field(description="Source name", examples=["b4w", "comdirect_giro"])
+    source_row_id: int = Field(description="Primary key of the staging table row")
+    account_iban: str
+    account_currency: str
+    date_valid: date
+    amount: Amount
+    amount_currency: str
+    date_book: date | None = None
+    text: str | None = None
+    other_name: str | None = None
+    other_iban: str | None = None
+    category: Category | None = None
+
+    @computed_field  # type: ignore[prop-decorator]
+    @property
+    def hash_id(self) -> str:
+        return hashify(
+            self.source,
+            self.account_iban,
+            self.date_valid,
+            f"{self.amount:.2f}",
+            self.text,
+            self.other_name,
+        )
+
+    def parameters_to_dict(self) -> dict[str, str]:
+        return {
+            "source": f"{self.source}",
+            "source_row_id": f"{self.source_row_id}",
+            "account_iban": f"{self.account_iban}",
+            "account_currency": f"{self.account_currency}",
+            "date_valid": date2str(self.date_valid),
+            "amount": f"{self.amount}",
+            "amount_currency": f"{self.amount_currency}",
+            "date_book": date2str(self.date_book),
+            "text": f"{self.text or ''}",
+            "other_name": f"{self.other_name or ''}",
+            "other_iban": f"{self.other_iban or ''}",
+            "category": (self.category.to_str() if self.category else "") or "",
+        }
+
+
+class TransactionDb(IngestdbBase):
+    __tablename__ = "transactions"
+    __table_args__ = (
+        UniqueConstraint("hash_id", name="uq_transactions_hash"),
+        Index("ix_transactions_source_row_id", "source", "source_row_id"),
+    )
+
+    source: Mapped[str] = mapped_column(String, nullable=False)
+    source_row_id: Mapped[int] = mapped_column(Integer, nullable=False)
+    date_book: Mapped[date | None] = mapped_column(Date, nullable=True)
+    other_name: Mapped[str | None] = mapped_column(String, nullable=True)
+    other_iban: Mapped[str | None] = mapped_column(String, nullable=True)
+    category_id: Mapped[int | None] = mapped_column(
+        ForeignKey("category.id"), nullable=True
+    )
+
+    category = relationship("CategoryDb")

src/models_db.py

@@ -1,56 +0,0 @@
-#!/bin/python
-
-from sqlalchemy import (
-    Column,
-    Date,
-    ForeignKey,
-    Integer,
-    Numeric,
-    String,
-    UniqueConstraint,
-)
-from sqlalchemy.orm import DeclarativeBase, relationship
-
-
-class BaseModelDb(DeclarativeBase):
-    pass
-
-
-class CategoryDb(BaseModelDb):
-    __tablename__ = "category"
-    __table_args__ = (
-        UniqueConstraint("name", "parent_id", name="uq_category_name_parent"),
-    )
-
-    id = Column(Integer, primary_key=True, autoincrement=True)
-    name = Column(String, nullable=False)
-    parent_id = Column(Integer, ForeignKey("category.id"), nullable=True)
-
-    # Relationships
-    parent = relationship(
-        "CategoryDb", remote_side="CategoryDb.id", back_populates="children"
-    )
-    children = relationship("CategoryDb", back_populates="parent")
-
-    UniqueConstraint("name", "parent_id", name="uq_category_name_parent")
-
-
-class B4wDb(BaseModelDb):
-    __tablename__ = "import_b4w"
-
-    id = Column(Integer, primary_key=True, autoincrement=True)
-    id_b4w = Column(Integer, nullable=False, unique=True)
-    account_iban = Column(String, nullable=False)
-    account_currency = Column(String(3), nullable=False)
-    date_valid = Column(Date, nullable=False)
-    date_book = Column(Date, nullable=True)
-    amount = Column(Numeric(12, 2), nullable=False)
-    amount_currency = Column(String(3), nullable=False)
-    reference = Column(String, nullable=True)
-    other_name = Column(String, nullable=True)
-    other_iban = Column(String, nullable=True)
-    category_id = Column(Integer, ForeignKey("category.id"), nullable=True)
-    notes = Column(String, nullable=True)
-
-    # relationship
-    category = relationship("CategoryDb")

src/reader.py

@@ -1,17 +0,0 @@
-#!/bin/python
-
-
-import csv
-from pathlib import Path
-
-from src.models import B4wExport
-
-
-def reader_raw(path: Path):
-    with path.open() as fid:
-        return list(csv.DictReader(fid))
-
-
-def reader_b4w(path: Path):
-    raw = reader_raw(path)
-    return list(map(B4wExport.model_validate, raw))

tests/conftest.py

@@ -1,17 +1,23 @@
-#!/bin/python
-
 import os
-from collections.abc import Generator
+from collections.abc import Callable, Generator
+from pathlib import Path
+from typing import Any, cast
 
 os.environ["DATABASE_URL"] = "sqlite://"
 
 import pytest
 from alembic.config import Config
-from sqlalchemy import StaticPool, create_engine
+from sqlalchemy import Engine, StaticPool, create_engine
 from sqlalchemy.orm import Session, sessionmaker
 
 from alembic import command
 from src.db import set_engine
+from src.ingest.b4w import upsert_b4w
+from tests.factories import B4wExportFactory
+
+DEFAULT_B4W_ROWS = 10
+# ``*.db`` and ``.local`` are gitignored, so artifacts are never committed.
+TEST_DB_DIR = Path(os.environ.get("TEST_DB_DIR", ".local/test-dbs"))
 
 
 @pytest.fixture()
@@ -34,3 +40,80 @@ def db_session() -> Generator[Session]:
     finally:
         session.close()
         engine.dispose()
+
+
+@pytest.fixture()
+def db_session_factory() -> Generator[Callable[[str], Session]]:
+    """Create named, file-backed SQLite databases that survive the test run.
+
+    Each call recreates ``<TEST_DB_DIR>/<name>.db`` from scratch (overwriting
+    the artifact of the previous run), runs the migrations and returns a
+    session. The files are intentionally *not* removed on teardown, so the last
+    created instance can be inspected afterwards, e.g.::
+
+        sqlite3 .local/test-dbs/b4w_basic.db
+    """
+    engines: list[Engine] = []
+
+    def make(name: str) -> Session:
+        TEST_DB_DIR.mkdir(parents=True, exist_ok=True)
+        db_path = (TEST_DB_DIR / f"{name}.db").resolve()
+        # Start from a clean database: overwrite whatever the last run left.
+        for suffix in ("", "-wal", "-shm"):
+            Path(f"{db_path}{suffix}").unlink(missing_ok=True)
+
+        engine = create_engine(f"sqlite:///{db_path}")
+        engines.append(engine)
+        set_engine(engine)  # alembic/env.py picks this up via get_set_engine()
+
+        alembic_cfg = Config("alembic.ini")
+        command.upgrade(alembic_cfg, "head")
+
+        return sessionmaker(bind=engine)()
+
+    try:
+        yield make
+    finally:
+        for engine in engines:
+            engine.dispose()
+
+
+@pytest.fixture()
+def populated_db_b4w(
+    db_session_factory: Callable[[str], Session],
+) -> Callable[..., Session]:
+    """Populate ``import_b4w`` (and ``category``) in a named, persisted DB.
+
+    Only the first-layer ingestion table is filled; no further processing.
+    ``**kwargs`` are forwarded to ``B4wExportFactory.build``; callable values
+    are resolved per row (e.g. ``ValDt=lambda: faker.date_between(...)``).
+    An optional ``setup`` callback runs after database creation and before rows
+    are inserted.
+    ``Id1`` is reserved: it is set per row (``1..row_count``) and cannot be
+    overridden via ``**kwargs``.
+    The returned session is *not* closed by the fixture; close it in the test.
+    """
+
+    def populate_db_b4w(
+        name: str,
+        row_count: int = DEFAULT_B4W_ROWS,
+        *,
+        setup: Callable[[Session], None] | None = None,
+        **kwargs: Any,
+    ) -> Session:
+        if "Id1" in kwargs:
+            raise ValueError(
+                "Id1 is set per row (1..row_count) by populated_db_b4w and "
+                "cannot be overridden via **kwargs"
+            )
+        session = db_session_factory(name)
+        if setup is not None:
+            setup(session)
+        for i in range(row_count):
+            row_kwargs = {k: (v() if callable(v) else v) for k, v in kwargs.items()}
+            row = B4wExportFactory.build(Id1=i + 1, **cast(dict[str, Any], row_kwargs))
+            upsert_b4w(session, row, do_commit=False)
+        session.commit()
+        return session
+
+    return populate_db_b4w

tests/factories.py

@@ -1,13 +1,141 @@
-#!/bin/python
+from decimal import Decimal
+from pathlib import Path
+from typing import Any
 
+from faker import Faker
 from polyfactory.factories.pydantic_factory import ModelFactory
+from polyfactory.fields import Use
 
-from src.models import B4wExport
+from src.models.b4w import B4wExport
+from src.models.category import Category
+from src.models.comdirect import ComdirectCreditCard, ComdirectDepot, ComdirectGiro
+from src.models.transactions import Transaction
+
+CATEGORY_PATHS = tuple(
+    line.strip()
+    for line in (
+        Path(__file__).resolve().parents[1]
+        / "scripts/initial_load/categories/categories.txt"
+    )
+    .read_text(encoding="utf-8")
+    .splitlines()
+    if line.strip()
+)
+
+
+def _category_from_path(path: str) -> Category:
+    category = Category.from_str(path)
+    if category is None:
+        raise ValueError("Category list contains an empty path")
+    return category
+
+
+class CategoryFactory:
+    __faker__ = Faker("de_DE")
+
+    @classmethod
+    def build(cls) -> Category:
+        return _category_from_path(cls.__faker__.random_element(CATEGORY_PATHS))
+
+    @staticmethod
+    def build_all() -> list[Category]:
+        return [_category_from_path(path) for path in CATEGORY_PATHS]
+
+
+def _faker_or_none(faker: Faker, non_default: Any, default: Any = None, p_value=0.5):
+    if faker.pyfloat(min_value=0.0, max_value=1.0) < p_value:
+        return default
+    return non_default
+
+
+def _amount() -> Decimal:
+    return B4wExportFactory.__faker__.pydecimal(
+        left_digits=6,
+        right_digits=2,
+        positive=True,
+        min_value=Decimal("0.01"),
+    )
+
+
+def _amount_eur() -> str:
+    """Generate German-formatted decimal string (e.g., '32,43')."""
+    val = Faker().pydecimal(
+        right_digits=2, min_value=Decimal("-4000.00"), max_value=Decimal("4000.00")
+    )
+    # Format as German string with comma decimal separator
+    return f"{val:.2f}".replace(".", ",").strip()
+
+
+def _german_date() -> str:
+    return Faker().date("%d.%m.%Y")
+
+
+def _sentence() -> str:
+    return B4wExportFactory.__faker__.sentence(
+        nb_words=8,
+        variable_nb_words=False,
+    )
+
+
+def _names() -> str:
+    return B4wExportFactory.__faker__.company()
+
+
+def _iban() -> str:
+    return B4wExportFactory.__faker__.iban()
+
+
+def _iban_or_none() -> str:
+    return _faker_or_none(Faker(), Faker().iban(), default="")
 
-CATEGORIES = [
-        "single_category",
-        "root_category:parent_category:leaf_category",
-        ]
 
 class B4wExportFactory(ModelFactory[B4wExport]):
-    __model__ = B4wExport
+    __faker__ = Faker("de_DE")
+    __use_examples__ = True
+
+    Amt = Use(_amount)
+    RmtInf = Use(_sentence)
+    Notes = Use(_sentence)
+    RmtdNm = Use(_names)
+    OwnrAcctIBAN = Use(_iban)
+    RmtdAcctIBAN = Use(_iban_or_none)
+
+
+class ComdirectGiroFactory(ModelFactory[ComdirectGiro]):
+    __faker__ = Faker("de_DE")
+    __use_examples__ = True
+
+    text = Use(_sentence)
+    amount_eur = Use(_amount_eur)
+    date_val = Use(_german_date)
+    date_book = Use(_german_date)
+
+
+class ComdirectCreditCardFactory(ModelFactory[ComdirectCreditCard]):
+    __faker__ = Faker("de_DE")
+    __use_examples__ = True
+
+    text = Use(_sentence)
+    amount_eur = Use(_amount_eur)
+    date_val = Use(_german_date)
+    date_book = Use(_german_date)
+
+
+class ComdirectDepotFactory(ModelFactory[ComdirectDepot]):
+    __faker__ = Faker("de_DE")
+    __use_examples__ = True
+
+    amount_eur = Use(_amount_eur)
+    date_val = Use(_german_date)
+    num = Use(_amount_eur)
+    spot_price = Use(_amount_eur)
+
+
+class TransactionFactory(ModelFactory[Transaction]):
+    __faker__ = Faker("de_DE")
+    __use_examples__ = True
+
+    account_iban = Use(_iban)
+    text = Use(_sentence)
+    other_name = Use(_names)
+    other_iban = Use(_iban_or_none)

tests/test_category_budget.py

@@ -0,0 +1,112 @@
+from datetime import date
+from decimal import Decimal
+
+from sqlalchemy import inspect
+from sqlalchemy.orm import Session
+
+from src.models.category import CategoryBudgetDb, CategoryDb
+from tests.factories import CategoryFactory
+
+
+def test_category_budget_schema(db_session: Session):
+    inspector = inspect(db_session.get_bind())
+    columns = {c["name"]: c for c in inspector.get_columns("category_budget")}
+
+    assert set(columns) == {
+        "id",
+        "category_id",
+        "amount_eur",
+        "valid_from",
+        "valid_to",
+    }
+    assert columns["id"]["nullable"] is False
+    assert columns["category_id"]["nullable"] is False
+    assert columns["amount_eur"]["nullable"] is False
+    assert columns["valid_from"]["nullable"] is True
+    assert columns["valid_to"]["nullable"] is True
+    assert str(columns["amount_eur"]["type"]) == "NUMERIC(12, 2)"
+
+    foreign_keys = inspector.get_foreign_keys("category_budget")
+    assert len(foreign_keys) == 1
+    assert foreign_keys[0]["constrained_columns"] == ["category_id"]
+    assert foreign_keys[0]["referred_table"] == "category"
+
+
+def test_category_budget_defaults_null_dates(db_session: Session):
+    category = CategoryDb(name=CategoryFactory.build().name)
+    db_session.add(category)
+    db_session.flush()
+
+    budget = CategoryBudgetDb(category_id=category.id, amount_eur=Decimal("150.00"))
+    db_session.add(budget)
+    db_session.commit()
+    db_session.refresh(budget)
+
+    assert budget.id is not None
+    assert budget.category_id == category.id
+    assert budget.amount_eur == Decimal("150.00")
+    # Null means unbounded in either direction.
+    assert budget.valid_from is None
+    assert budget.valid_to is None
+
+
+def test_category_budget_date_window(db_session: Session):
+    category = CategoryDb(name=CategoryFactory.build().name)
+    db_session.add(category)
+    db_session.flush()
+
+    budget = CategoryBudgetDb(
+        category_id=category.id,
+        amount_eur=Decimal("200.50"),
+        valid_from=date(2026, 10, 1),
+        valid_to=date(2026, 10, 31),
+    )
+    db_session.add(budget)
+    db_session.commit()
+    db_session.refresh(budget)
+
+    assert budget.valid_from == date(2026, 10, 1)
+    assert budget.valid_to == date(2026, 10, 31)
+
+
+def test_category_budget_relationship_both_ways(db_session: Session):
+    category = CategoryDb(name=CategoryFactory.build().name)
+    db_session.add(category)
+    db_session.flush()
+
+    budget = CategoryBudgetDb(category_id=category.id, amount_eur=Decimal("1.00"))
+    db_session.add(budget)
+    db_session.commit()
+
+    # Force re-read from the database so the relationship is loaded, not
+    # just resolved from the session identity map.
+    db_session.expire_all()
+    assert [b.id for b in category.budgets] == [budget.id]
+    assert budget.category.id == category.id
+
+
+def test_category_has_multiple_budgets(db_session: Session):
+    category = CategoryDb(name=CategoryFactory.build().name)
+    db_session.add(category)
+    db_session.flush()
+
+    budgets = [
+        CategoryBudgetDb(
+            category_id=category.id,
+            amount_eur=Decimal("1200.00"),
+            valid_from=date(2026, 10, 1),
+            valid_to=date(2026, 10, 31),
+        ),
+        CategoryBudgetDb(
+            category_id=category.id,
+            amount_eur=Decimal("1300.00"),
+            valid_from=date(2026, 11, 1),
+            valid_to=date(2026, 11, 30),
+        ),
+    ]
+    for budget in budgets:
+        db_session.add(budget)
+    db_session.commit()
+    db_session.expire_all()
+
+    assert [b.id for b in category.budgets] == [b.id for b in budgets]

tests/test_category_edge_cases.py

@@ -0,0 +1,164 @@
+from datetime import date
+from decimal import Decimal
+
+import pytest
+
+from src.models.category import Category, CategoryBudget
+from tests.factories import CategoryFactory
+
+
+class TestCategoryComputedFields:
+    """Tests for Category's computed fields and special methods."""
+
+    def test_hash_id_computed_field_simple(self):
+        """Test hash_id for single-level category."""
+        c = Category.from_str("single")
+        assert c
+        assert hasattr(c, "hash_id")
+        assert isinstance(c.hash_id, str)
+        # Hash should be deterministic for same inputs
+        c2 = Category.from_str("single")
+        assert c2
+        assert c.hash_id == c2.hash_id
+
+    def test_hash_id_computed_field_nested(self):
+        """Test hash_id for multi-level category hierarchy."""
+        c1 = Category.from_str("level1:level2:level3")
+        assert c1
+        assert hasattr(c1, "hash_id")
+
+        c2 = Category.from_str("level1:level2:level3")
+        assert c2
+        assert c1.hash_id == c2.hash_id
+
+    def test_hash_id_different_hierarchy(self):
+        """Test that different hierarchies have different hash_ids."""
+        c1 = Category.from_str("A:B")
+        c2 = Category.from_str("A:C")
+        assert c1
+        assert c2
+        # Different last level -> different hash_id
+        assert c1.hash_id != c2.hash_id
+
+    def test_hash_id_same_name_different_parent(self):
+        """Test that same name but different parent gives different hash."""
+        root = Category(name="Budget")
+        cat1 = Category(name="Budget", parent=root)
+
+        # Create another with same name but no parent
+        orphan = Category.from_str("Budget")
+        assert orphan
+
+        assert cat1.hash_id != orphan.hash_id
+
+    def test_to_str_single_level(self):
+        """Test to_str() for single-level category."""
+        c = Category.from_str("single")
+        assert c
+        assert c.to_str() == "single"
+
+    def test_to_str_nested(self):
+        """Test to_str() for nested category."""
+        c = Category.from_str("parent:child:grandchild")
+        assert c
+        assert c.to_str() == "parent:child:grandchild"
+
+    def test_str_uses_to_str(self):
+        """Test that __str__ delegates to to_str()."""
+        c = Category.from_str("A:B:C")
+        assert c
+        assert str(c) == c.to_str() == "A:B:C"
+
+    def test_repr_simple(self):
+        """Test repr() for single-level category."""
+        c = Category.from_str("single")
+        expected = 'Category.from_str("single")'
+        assert repr(c) == expected
+
+    def test_repr_nested(self):
+        """Test repr() for nested category."""
+        c = Category.from_str("parent:child")
+        expected = 'Category.from_str("parent:child")'
+        assert repr(c) == expected
+
+
+class TestCategoryBudgetValidation:
+    """Tests for CategoryBudget's date range validation."""
+
+    def test_valid_budget_no_dates(self):
+        """Budget with None dates is valid."""
+        cat = CategoryFactory.build()
+        budget = CategoryBudget(
+            category=cat,
+            amount_eur=Decimal("100.00"),
+        )
+        assert budget.valid_from is None
+        assert budget.valid_to is None
+
+    def test_valid_budget_with_dates(self):
+        """Budget with valid date range is accepted."""
+
+        cat = CategoryFactory.build()
+        budget = CategoryBudget(
+            category=cat,
+            amount_eur=Decimal("100.00"),
+            valid_from=date(2026, 10, 1),
+            valid_to=date(2026, 10, 31),
+        )
+        assert budget.valid_from == date(2026, 10, 1)
+        assert budget.valid_to == date(2026, 10, 31)
+
+    def test_invalid_date_range_raises(self):
+        """Budget with valid_from > valid_to raises ValueError."""
+
+        cat = CategoryFactory.build()
+
+        with pytest.raises(ValueError) as exc_info:
+            CategoryBudget(
+                category=cat,
+                amount_eur=Decimal("100.00"),
+                valid_from=date(2026, 10, 31),
+                valid_to=date(2026, 10, 1),
+            )
+
+        assert "valid_from" in str(exc_info.value)
+        assert "valid_to" in str(exc_info.value)
+        assert "nor in order" in str(exc_info.value)
+
+    def test_valid_budget_exact_boundary(self):
+        """Budget with exact same from and to is valid (single day)."""
+
+        cat = CategoryFactory.build()
+        budget = CategoryBudget(
+            category=cat,
+            amount_eur=Decimal("100.00"),
+            valid_from=date(2026, 10, 1),
+            valid_to=date(2026, 10, 1),
+        )
+        assert budget.valid_from == date(2026, 10, 1)
+        assert budget.valid_to == date(2026, 10, 1)
+
+    def test_validation_preserves_original_values(self):
+        """Validation doesn't change the model's original values."""
+
+        cat = CategoryFactory.build()
+        budget = CategoryBudget(
+            category=cat,
+            amount_eur=Decimal("150.75"),
+            valid_from=date(2026, 9, 1),
+            valid_to=date(2026, 9, 30),
+        )
+
+        # Create an invalid one (valid_from > valid_to) and verify validation catches it
+        try:
+            CategoryBudget(
+                category=cat,
+                amount_eur=Decimal("200.00"),
+                valid_from=date(2026, 12, 31),
+                valid_to=date(2026, 12, 30),
+            )
+        except ValueError:
+            pass  # Expected
+
+        # Valid one should still have original values
+        assert budget.amount_eur == 150.75

tests/test_category_tree.py

@@ -0,0 +1,116 @@
+from src.models.category import Category
+from src.models.category_tree import (
+    CategoryTree,
+    _transaction_to_category_branch,
+    build_category_tree,
+)
+from src.models.transactions import Transaction
+from tests.factories import TransactionFactory
+
+
+def test_transaction_to_category_branch_simple():
+    transaction = TransactionFactory.build(category=Category.from_str("dummy category"))
+    result = _transaction_to_category_branch(transaction)
+    assert isinstance(result, CategoryTree)
+    assert result.category
+    assert result.category.name == "dummy category"
+    assert result.transactions
+    assert isinstance(result.transactions, list)
+    assert len(result.transactions) == 1
+    assert isinstance(result.transactions[0], Transaction)
+
+
+def test_transaction_to_category_branch_two_category_levels():
+    transaction = TransactionFactory.build(category=Category.from_str("father:son"))
+    result = _transaction_to_category_branch(transaction)
+    assert isinstance(result, CategoryTree)
+    assert result.category
+    assert result.category.name == "father"
+    assert result.transactions is None
+    assert result.sub_categories
+    assert isinstance(result.sub_categories, list)
+    assert len(result.sub_categories) == 1
+    assert isinstance(result.sub_categories[0], CategoryTree)
+    assert isinstance(result.sub_categories[0].category, Category)
+    assert result.sub_categories[0].category.name == "son"
+    assert result.sub_categories[0].transactions
+    assert isinstance(result.sub_categories[0].transactions, list)
+    assert len(result.sub_categories[0].transactions) == 1
+    assert isinstance(result.sub_categories[0].transactions[0], Transaction)
+    assert result.sub_categories[0].transactions[0] == transaction
+
+
+def test_transaction_to_category_branch_no_category():
+    transaction = TransactionFactory.build(category=None)
+    result = _transaction_to_category_branch(transaction)
+    assert result.category is None
+    assert result.transactions
+    assert isinstance(result.transactions, list)
+    assert len(result.transactions) == 1
+    assert result.transactions[0] == transaction
+
+
+def test_category_tree_add():
+    category_tree_1 = CategoryTree(
+        category=Category.from_str("super"),
+        sub_categories=[
+            CategoryTree(
+                category=Category.from_str("super:sub1"),
+                transactions=[TransactionFactory.build(amount=10)],
+            ),
+            CategoryTree(
+                category=Category.from_str("super:sub2"),
+                transactions=[TransactionFactory.build(amount=30)],
+            ),
+        ],
+    )
+    category_tree_2 = CategoryTree(
+        category=Category.from_str("super"),
+        sub_categories=[
+            CategoryTree(
+                category=Category.from_str("super:sub2"),
+                transactions=[TransactionFactory.build(amount=20)],
+            ),
+            CategoryTree(
+                category=Category.from_str("super:sub3"),
+                transactions=[TransactionFactory.build(amount=100)],
+            ),
+        ],
+    )
+    result = category_tree_1 + category_tree_2
+    assert result
+    assert result.sub_categories
+    assert isinstance(result.sub_categories, list)
+    assert len(result.sub_categories) == 3
+    assert all(s.category for s in result.sub_categories)
+    assert sorted([s.category.name for s in result.sub_categories]) == [
+        "sub1",
+        "sub2",
+        "sub3",
+    ]
+    assert result.total_amount == 160.0
+
+
+def test_build_category_tree():
+    transactions = [
+        TransactionFactory.build(category=Category.from_str("super1:sub1"), amount=10),
+        TransactionFactory.build(category=Category.from_str("super1:sub2"), amount=13),
+        TransactionFactory.build(
+            category=Category.from_str("super1:sub2:sub2_sub1"), amount=104
+        ),
+        TransactionFactory.build(
+            category=Category.from_str("super1:sub2:sub2_sub1"), amount=109
+        ),
+        TransactionFactory.build(category=Category.from_str("super2"), amount=5000),
+    ]
+    result = build_category_tree(transactions)
+    assert result
+    assert isinstance(result, list)
+    assert len(result) == 2
+    assert isinstance(result[0], CategoryTree)
+    assert result[0].category
+    assert result[0].category.name == "super1"
+    assert result[0].transactions is None
+    assert result[0].sub_categories
+    assert isinstance(result[0].sub_categories, list)
+    assert len(result[0].sub_categories) == 2

tests/test_data/b4w_export_dummy_01.csv

@@ -0,0 +1,51 @@
+Id1,OwnrAcctIBAN,OwnrAcctCcy,ValDt,BookgDt,Amt,AmtCcy,CdtDbtInd,RmtInf,RmtdNm,RmtdAcctIBAN,Category,Notes
+1036,DE07271846982018433140,GBP,2026-07-04,2023-10-12,608251.74,CHF,CRDT,Wohl Straße als gut Zeit laufen wenn Wissen.,Scholtz AG,DE05340442071223320995,Beruf:Gehalt:super Firma,Krank mich erschrecken Leute den nehmen fahren man.
+4849,DE42187219246703133408,CHF,2023-09-10,2025-08-05,725899.19,USD,CRDT,Berg im Bruder fröhlich Herr wahr wer leben.,Oestrovsky,DE58802771240736400847,Freizeit,Maus wohnen vergessen Vater plötzlich Schule Meer fallen.
+1914,DE70452496991202055362,USD,2025-04-15,2025-12-24,984194.63,GBP,CRDT,Schreiben sollen voll ab Wort kochen schlimm wohl.,Beckmann,DE59790637683034706744,Freizeit,Anfangen fünf weg Woche Boden schreiben hier hängen.
+6930,DE67943298499847570990,USD,2025-11-09,2021-09-08,156898.87,USD,DBIT,Verlieren sein dich Papa fragen ließ denn packen.,Heinz,DE54265758309837023543,Beruf:Gehalt:super Firma,Halbe so Leute Bild Schuh an früh traurig.
+1699,DE84149253738055473900,EUR,2026-08-01,2021-07-20,818063.51,EUR,CRDT,Rad grün schlecht Pferd beide noch erschrecken Uhr.,Hofmann Steinberg Stiftung & Co. KGaA,DE21220975806758335585,,Neun man kam sechs blau Sache langsam Blume.
+7046,DE82274490061461449020,EUR,2023-01-23,2024-05-14,669696.87,USD,DBIT,Vogel hinein Tante brauchen Weihnachten nicht klein braun.,Hübel GmbH,DE39283738756876306318,Freizeit,Ja Loch Winter rufen laufen Woche gelb hinter.
+366,DE25389044843010198038,USD,2024-02-09,2023-03-08,220167.30,USD,DBIT,Gefährlich nein Mann nie schlecht Arbeit treffen damit.,Scheuermann,DE77031936189338919289,Lebenshaltung:Lebensmitteleinkäuft,Sofort Blume ging warten gewinnen kaufen Wissen später.
+6922,DE73307102808802733774,USD,2025-03-20,2023-01-30,129827.89,EUR,DBIT,Rennen jetzt damit Brief See dumm stellen legen.,Reuter auch Schlauchin GmbH & Co. KG,DE22372707001113794894,Lebenshaltung:Lebensmitteleinkäuft,Hart ins sagen fest eigentlich wo schlimm ganz.
+9114,DE16057368814344996724,USD,2021-03-08,2020-10-16,725225.13,EUR,DBIT,Kam waschen Wohnung Sache sprechen kaufen gern spielen.,Hentschel Wilms KG,DE41311487016568247161,Beruf:Gehalt:super Firma,Haare Winter bauen Mädchen gesund Teller hoch deshalb.
+6739,DE05970178849203811396,GBP,2020-05-13,2020-08-18,333023.84,GBP,CRDT,Bin schicken unser Tier will endlich dem gefährlich.,Heuser Wiek KG,DE75493228729510129693,Beruf:Gehalt:super Firma,Versuchen etwas fertig den schnell fast Bein Freude.
+1278,DE96528552228817399257,CHF,2024-07-25,2024-11-16,385205.95,EUR,CRDT,Auge darin ohne Schnee Frage stark mein oft.,Scholl,DE70979826731102142893,Lebenshaltung:Lebensmitteleinkäuft,Spät Minutenmir Brief Essen geben heiß nah warm.
+406,DE89506092918989440859,EUR,2024-11-13,2026-03-18,978962.38,CHF,DBIT,Kaufen turnen Weg dick ging vom rund Sommer.,Thies,DE36862593824516545526,Beruf:Gehalt:super Firma,Für Zeit Fenster Abend warten Geschichte dann stellen.
+2026,DE14445771047668409127,GBP,2020-05-06,2024-02-20,967493.86,EUR,CRDT,Glück verlieren Wetter Bauer turnen baden Freude spät.,Mohaupt GmbH & Co. KG,DE52407611264263373889,,Winter nicht bis beide hängen Rad Meer lassen.
+3041,DE58304085373743696607,USD,2024-03-10,2026-09-08,807803.15,EUR,CRDT,Auch schlimm groß bauen Welt das alt alle.,Hartmann AG,DE37816718253864239200,Lebenshaltung:Lebensmitteleinkäuft,Spiel erst nicht gelb Vogel über fahren Hilfe.
+5405,DE05257576358009350425,GBP,2024-05-30,2022-05-29,611553.21,EUR,DBIT,Darin gut ihn reich mit mögen dauern Ferien.,Rosenow,DE29315257044202664260,Lebenshaltung:Lebensmitteleinkäuft,Tief Tag Polizei Zahl Sommer Abend neun vom.
+6543,DE91371884570994329173,CHF,2025-07-16,2022-09-05,762232.56,USD,DBIT,Monate Glas waschen Brief fliegen gesund Essen kam.,Jäntsch Ullrich AG & Co. KG,DE33181542563621737977,,Versuchen waschen gestern Fahrrad Arbeit zwischen können ich.
+5190,DE13303497125457728906,CHF,2020-06-26,2022-01-18,944585.95,EUR,DBIT,Das Sonne Klasse frei beide dort Vogel fiel.,Margraf,DE67573080640653441068,Beruf:Gehalt:super Firma,Reich fiel führen Tisch fertig gesund Stein Wagen.
+6694,DE32400010286267483201,GBP,2024-02-15,2022-09-05,896628.93,EUR,CRDT,Genau Wiese danach auf Land Fuß Zahl braun.,Weinhold,DE82843035570517646373,Beruf:Gehalt:super Firma,Fehlen Licht hinein Frage möglich Hund sechs danach.
+2153,DE70374437913789686109,USD,2024-02-23,2020-07-19,809680.27,USD,CRDT,Schon ließ Arzt Arbeit müde hoch Tag auch.,Roskoth,DE61342749791049237138,Beruf:Gehalt:super Firma,Zu weit Freund Brief noch durch seit sofort.
+1462,DE07599923076063186293,USD,2022-03-05,2021-11-29,563454.79,CHF,CRDT,Bei stark über denn wo Lehrer gibt las.,Gehringer AG,DE71382372368571415704,Beruf:Gehalt:super Firma,Schwarz finden laut werden Zug Vater aber schreiben.
+4268,DE75725070066084697801,USD,2023-12-21,2025-06-24,461694.56,GBP,DBIT,Schule Küche Erde letzte Schnee halten und sechs.,Scholtz Pärtzelt AG & Co. KG,DE63255914448215384283,Lebenshaltung:Lebensmitteleinkäuft,Zurück spät trinken Tür Stunde Boden Licht Ende.
+3951,DE05688473582233220472,GBP,2022-08-15,2023-01-18,998250.23,GBP,DBIT,Weit draußen Feuer eigentlich wünschen Wagen fertig tragen.,Binner AG & Co. KGaA,DE73947638506756550295,Beruf:Gehalt:super Firma,Dumm verlieren nehmen erschrecken fressen zurück hängen weit.
+1124,DE90298843179938014585,GBP,2023-11-14,2023-07-05,371813.63,USD,DBIT,Platz fragen wer weinen Geburtstag ganz einigen gar.,Boucsein Stiftung & Co. KG,DE05290733575870594578,Lebenshaltung:Lebensmitteleinkäuft,Weg andere wohnen steigen Hilfe schaffen mehr das.
+1744,DE13238979080075655943,GBP,2022-12-14,2025-02-19,579578.97,EUR,DBIT,Immer fiel wieder überall bald legen Tisch wahr.,Heser Hahn GmbH,DE68405054791747194888,Lebenshaltung:Lebensmitteleinkäuft,Fünf See neu früh wird fehlen sonst wer.
+5892,DE04011963778496207452,USD,2025-05-20,2023-05-10,648012.28,EUR,DBIT,Polizei weinen gut Kind immer Ding oder Licht.,Jacobi Jäckel,DE13372573108475954117,Lebenshaltung:Lebensmitteleinkäuft,Fragen immer acht Sache heute nämlich Platz warum.
+362,DE92124261075456158918,EUR,2022-10-26,2025-08-31,299548.47,CHF,DBIT,Laufen ihr lassen Pferd ruhig müssen Hund unten.,Sölzer Meyer OHG mbH,DE93416735067530701655,Beruf:Gehalt:super Firma,Schwimmen voll neun beim sehr dich Ferien Nase.
+9327,DE56968036606213916258,EUR,2022-09-12,2025-06-10,669422.17,EUR,CRDT,Reich kochen Ende früher denken Gott bauen Wagen.,Rogge Carsten AG & Co. KG,DE17055312400520689014,,Schwer verkaufen oder gefährlich sprechen Hunger rot ins.
+680,DE41089047416450094816,GBP,2025-06-19,2020-11-14,514360.52,EUR,DBIT,Essen schlimm schnell sich vor drei Ding schwimmen.,Stroh Margraf GmbH,DE30951508691902962996,Freizeit,Drei gelb Meer mit rot Hand da führen.
+4786,DE42895215744806933501,USD,2024-10-12,2021-06-23,421775.78,USD,DBIT,Rennen rund und acht werden wieder richtig Tür.,Pieper KG,DE50031826122338744320,Lebenshaltung:Lebensmitteleinkäuft,Monate Licht bis Himmel nächste von Stück ab.
+5155,DE48350990582715356385,EUR,2024-01-16,2020-07-12,132026.65,CHF,DBIT,Freude setzen offen bauen offen aus Bruder wirklich.,Oestrovsky Mülichen Stiftung & Co. KG,DE31183689182369696496,,Hund legen Schiff einige Brief schlecht jeder voll.
+9202,DE79223829316538123746,CHF,2024-10-23,2026-09-07,683650.17,GBP,CRDT,Platz gelb heiß uns Abend schreien bis ziehen.,Meyer OHG mbH,DE85492444746577878500,Lebenshaltung:Lebensmitteleinkäuft,Angst schwarz war Auge darauf Lehrerin gerade oft.
+4370,DE96935887403881776524,CHF,2022-03-09,2025-06-12,238525.09,GBP,DBIT,Sitzen Katze vergessen schicken laufen spielen deshalb weiter.,Müller,DE64513317359137578745,,Gesicht fangen klein Glas ein ohne seit Gesicht.
+6861,DE53091086333961111752,EUR,2022-01-18,2020-04-09,949477.16,GBP,DBIT,Gerade genau dürfen gelb klettern nächste zum Bauer.,Schleich,DE55073850335806125294,Beruf:Gehalt:super Firma,Mit weil rechnen Hund Wiese einmal ja gern.
+1968,DE98454978214248264491,GBP,2024-01-14,2022-09-19,435993.30,CHF,CRDT,Apfel setzen Polizei einfach Minutenmir schnell zwischen vom.,Schulz GmbH,DE08932615790658012392,Beruf:Gehalt:super Firma,Schwer spielen Leben sind brauchen Finger dabei Essen.
+934,DE72179461629364066237,GBP,2020-12-07,2023-12-31,936759.29,GBP,CRDT,Selbst aber treffen springen setzen hoch lesen zusammen.,Textor Schaaf AG & Co. KG,DE68736100578473881809,Lebenshaltung:Lebensmitteleinkäuft,Warm unser gehören Zug früher schlagen stehen langsam.
+288,DE36079718826004443058,USD,2025-03-20,2024-07-16,410828.73,GBP,DBIT,Bauen Geschenk Hund beide Stück Sohn ab denken.,Drewes,DE37024088386878351977,Lebenshaltung:Lebensmitteleinkäuft,Dürfen jetzt danach Oma See alt Flasche sofort.
+909,DE07992119720440262287,CHF,2024-02-20,2020-10-05,713491.26,GBP,CRDT,Ende krank Arzt Wohnung finden vom Blume Monat.,Kohl Ortmann AG,DE46570978124442579293,,Heute Haus nach ab heißen versuchen Schüler wahr.
+6200,DE65667575255962659468,USD,2024-12-29,2023-07-30,859574.20,EUR,CRDT,Erklären schreiben Frau kann leise Papa Arzt fliegen.,Wulf Grein Groth AG & Co. KG,DE45122342340503421393,Freizeit,Pferd gut schenken spät wirklich Kind bauen lange.
+5198,DE82737311374514326219,USD,2022-09-14,2025-12-23,899940.80,EUR,CRDT,Glauben wissen ab sehr zwischen Frau essen Minutenmir.,Schwital Mohaupt Stiftung & Co. KGaA,DE31111358336117661206,Lebenshaltung:Lebensmitteleinkäuft,Ihm rechnen drehen etwas jeder Gesicht zusammen vorbei.
+2088,DE84805952945908475488,GBP,2020-06-23,2023-03-19,706456.94,CHF,CRDT,Gerade zeigen Stück ziehen dumm Minutenmir alt Brief.,Thies GbR,DE30848702698273936264,,Fröhlich kaufen im gefährlich gar Zeitung leben voll.
+4094,DE96513254882011465283,USD,2021-03-12,2023-08-10,844148.26,GBP,DBIT,Fußball führen Tier nichts hoch Lehrerin brauchen grün.,Meister,DE39122919808000752227,Beruf:Gehalt:super Firma,Müde schauen rechnen Geschichte Apfel kann daran weinen.
+407,DE34550143031579571279,GBP,2020-03-01,2021-10-24,802001.66,EUR,CRDT,Scheinen wahr Luft merken Hilfe Sommer Weg sprechen.,Sager AG,DE95396414587780784446,Freizeit,Wasser jeder los werfen Loch Kopf Sommer stehen.
+1882,DE93756550001006525563,GBP,2020-05-22,2020-04-02,255936.18,CHF,CRDT,Schüler Wetter unser Nase lesen erklären Herr damit.,Bohlander e.G.,DE33912765450255003824,Lebenshaltung:Lebensmitteleinkäuft,Vielleicht Papa Sonntag Glück dem krank Ende Lehrer.
+674,DE34636975346401640379,GBP,2025-04-21,2023-07-13,107958.15,GBP,CRDT,Um rufen Schnee nämlich leise Tag gesund hin.,Ruppersberger Förster AG & Co. KG,DE82042132477947420315,Beruf:Gehalt:super Firma,Ich wo Oma Leute gegen früh Herz hoch.
+4938,DE18280828921382275721,CHF,2024-09-06,2026-06-01,307489.25,USD,CRDT,Zehn los stark wissen vor dein an Schule.,Holsten Bien e.G.,DE54634488965756369503,Freizeit,Er merken Seite von früher schlimm weit gestern.
+7493,DE75969937757392474988,EUR,2024-07-01,2025-05-15,769646.98,USD,CRDT,Wollen kalt alt uns acht heißen deshalb Licht.,Losekann Mentzel AG,DE06861731830241040674,Beruf:Gehalt:super Firma,Sehen los Herr dort ließ fährt gibt als.
+7741,DE27930829328207938603,USD,2023-12-10,2021-12-25,332130.35,CHF,DBIT,Unser Essen Ferien ließ Lehrerin bringen trinken wichtig.,Beer Dehmel OHG mbH,DE56877468032283033000,Lebenshaltung:Lebensmitteleinkäuft,Weil Dorf verlieren deshalb wirklich Himmel dein schreien.
+8664,DE17107663775980137420,USD,2020-12-02,2026-04-02,695808.54,EUR,CRDT,Da aber frei schlafen sicher Ding schreiben endlich.,Steckel,DE34731945010152636545,Beruf:Gehalt:super Firma,Plötzlich beißen bringen Boden auch verstecken lieb vorbei.
+7929,DE32942674407704323077,CHF,2020-09-06,2026-09-09,165324.34,EUR,CRDT,Sehen ob Bruder drei Kind dumm Hilfe auf.,Spieß Fröhlich KGaA,DE68174009519788157086,Freizeit,Stunde Hilfe ganz nie las kam oft voll.
+8900,DE03689805605701261449,USD,2021-03-03,2020-11-12,186334.15,USD,CRDT,Brief gern der Eis Freude lange schlagen Flasche.,Radisch Keudel GbR,DE49885385858776558412,Lebenshaltung:Lebensmitteleinkäuft,Dafür singen ein sonst uns Mensch ins Ding.

tests/test_data/comdirect_export_dummy_01.txt

@@ -0,0 +1,115 @@
+;
+"Umsätze Girokonto";"Zeitraum: 180 Tage";
+"Neuer Kontostand";"2.363,30 EUR";
+
+"Wertstellung (Valuta)";"Umsatz in EUR";"Buchungstag";"Vorgang";"Buchungstext"
+"12.01.2023";"-2.494,62";"28.09.2013";"Kartenumsatz";"Jeder Feuer fünf Hand Kind Jahr plötzlich leben."
+"03.11.2014";"3.840,37";"12.02.2023";"Kartenumsatz";"Nehmen Name schnell Tier schreien gefährlich Arzt Monate."
+"07.09.2008";"-1.895,07";"05.07.1999";"Kartenumsatz";"Frau stehen bleiben Minute Hund ein Fisch gern."
+"23.06.1971";"1.996,11";"27.05.2015";"Kartenumsatz";"Glück wie doch tief gefährlich rennen schlafen Milch."
+"28.05.1998";"3.183,63";"23.08.1993";"Lastschrift / Belastung";"Vom braun Seite fiel arbeiten bin kommen wichtig."
+"20.08.1972";"707,94";"22.10.2001";"Kartenumsatz";"Auch letzte böse geben kurz nämlich es nass."
+"21.09.2024";"-3.019,63";"25.12.1989";"Lastschrift / Belastung";"Boden böse denken oder sie denken später Kind."
+"09.06.2016";"-2.908,98";"30.01.1978";"Kartenumsatz";"Stadt sofort nein Lehrerin fünf reiten gehen Haare."
+"09.03.1994";"-2.972,60";"21.11.2009";"Lastschrift / Belastung";"Laut Weihnachten wenig dauern Schuh schwer alle nächste."
+"30.11.2017";"1.994,76";"29.09.2011";"Lastschrift / Belastung";"Früher ob darauf krank wo Leute nach für."
+"18.08.2013";"2.925,64";"16.02.2011";"Lastschrift / Belastung";"Weg wirklich Freude reich da erst man sind."
+"19.10.1973";"-.837,10";"04.09.1987";"Lastschrift / Belastung";"Los mögen Stunde Weihnachten nass wo drei ohne."
+"15.09.1975";"3.691,37";"19.01.2010";"Kartenumsatz";"Treffen glauben Spiel gab will vom waschen antworten."
+"10.07.2011";"3.650,99";"16.02.2012";"Lastschrift / Belastung";"Katze seit freuen freuen den Eis die traurig."
+"07.05.2022";"722,12";"12.01.1989";"Lastschrift / Belastung";"Tun an als finden wie klein aber nun."
+"06.02.2004";"1.499,05";"20.09.1986";"Lastschrift / Belastung";"Oder natürlich Essen zur rennen Platz spielen Monat."
+"26.10.2009";"-3.454,94";"21.06.2024";"Kartenumsatz";"Es Erde Hand bauen Winter gerade böse vom."
+"03.07.2013";"2.746,42";"23.01.1988";"Kartenumsatz";"Natürlich schon Tier Opa Fußball Stadt brauchen kochen."
+"25.06.2014";"1.487,38";"26.11.1979";"Lastschrift / Belastung";"Dunkel her möglich essen Pferd Stadt ziehen seit."
+"16.05.2009";"1.866,68";"21.12.1994";"Lastschrift / Belastung";"Genau wer glauben erklären nennen schicken Hilfe stellen."
+"26.12.1998";"-1.925,12";"06.02.1992";"Lastschrift / Belastung";"Katze gegen wo stellen uns sprechen fertig nah."
+"24.01.1996";"-1.089,91";"30.03.1992";"Lastschrift / Belastung";"Mich los Essen Lehrerin hinter heißen danach weit."
+"21.07.1973";"-3.206,61";"27.08.1984";"Kartenumsatz";"Dein Schuh Garten glauben Vater Opa die Gott."
+"22.11.1981";"1.112,51";"25.06.1974";"Lastschrift / Belastung";"Krank fast Papa verlieren Kopf Monate endlich ruhig."
+"01.11.1973";"-2.077,99";"05.08.2017";"Lastschrift / Belastung";"Ein liegen See jung wie Name Sonntag ihm."
+"26.08.1972";"-4.000,00";"25.01.2025";"Lastschrift / Belastung";"Darauf in dauern schön las jeder Freude Auto."
+"21.06.1989";"-3.639,78";"04.08.1982";"Kartenumsatz";"Wissen merken nie Essen Rad sitzen wo letzte."
+"02.12.1982";"-3.371,26";"19.07.2005";"Lastschrift / Belastung";"Setzen so dabei wenn es Hunger Meer Hase."
+"16.05.1987";"-1.715,06";"15.10.1984";"Lastschrift / Belastung";"Feuer Wald vor wo auf wohl fressen Haare."
+"05.04.2024";"322,78";"11.07.1988";"Lastschrift / Belastung";"Her Pferd zusammen arbeiten schenken gar Lehrer hinter."
+"25.12.1984";"397,36";"15.03.1978";"Kartenumsatz";"Essen blau deshalb laufen für am sieht weinen."
+"19.07.1970";"-2.245,70";"22.05.1991";"Kartenumsatz";"Vorbei wird braun bis Tier als erschrecken Ende."
+"21.11.2019";"732,25";"19.06.1993";"Lastschrift / Belastung";"Acht Minutenmir man böse natürlich rund immer heißen."
+"28.10.2003";"2.397,64";"21.07.2026";"Kartenumsatz";"Arzt kommen haben lassen fünf wer gar kochen."
+"16.10.1973";"2.271,59";"27.02.1987";"Lastschrift / Belastung";"Blume Auge weiter böse fallen Essen Erde kam."
+"12.01.2005";"1.472,05";"02.12.2006";"Kartenumsatz";"Lehrerin verkaufen Wald ziehen hin lesen Hilfe klettern."
+"02.05.2015";"2.284,43";"08.08.1991";"Lastschrift / Belastung";"Zu Freude Geld will Glück die seit vielleicht."
+"18.09.2012";"-1.940,73";"16.04.2016";"Lastschrift / Belastung";"So ein Mensch schenken am wir wollen merken."
+"13.03.2010";"1.899,59";"10.02.1997";"Kartenumsatz";"Das auch glauben Tür gewinnen schreien fangen Flasche."
+"01.03.1983";"3.566,27";"27.03.2015";"Kartenumsatz";"Bekommen warum ja wohnen gefährlich fährt langsam Monat."
+"14.01.2011";"-2.962,06";"07.03.2010";"Lastschrift / Belastung";"Gesund Minutenmir etwas fallen Nacht schaffen nach ihr."
+"30.05.2000";"-1.915,23";"29.08.1979";"Kartenumsatz";"Nennen leicht Name Schuh Bild reiten laut letzte."
+"11.10.1970";"-3.359,95";"31.05.2025";"Lastschrift / Belastung";"Den singen Wald Geschenk Wald durch Stück Oma."
+"10.09.2012";"3.953,53";"15.03.1993";"Kartenumsatz";"Um Opa fragen müssen endlich Bein leben zum."
+"21.11.2012";"-1.197,06";"17.04.1999";"Kartenumsatz";"Ist also wo Eis zum Stück kommen Hunger."
+"12.07.1996";"2.381,22";"23.04.2010";"Lastschrift / Belastung";"Dich Auge können Stück seit fliegen trinken können."
+"13.03.1988";"1.748,03";"01.06.1996";"Lastschrift / Belastung";"Berg Leben steigen Licht nehmen vom Hilfe Kind."
+"29.12.1979";"1.727,59";"26.07.1998";"Lastschrift / Belastung";"Nämlich laufen Stelle nächste noch schwimmen Wagen grün."
+"09.02.1973";"-.393,09";"28.12.1979";"Lastschrift / Belastung";"Reich Onkel schön danach Flasche klein am wahr."
+"12.11.1982";"727,08";"26.04.2001";"Kartenumsatz";"Lustig dem zehn mich fressen Straße Auto langsam."
+
+"Alter Kontostand";"1.632,48 EUR";
+
+"Umsätze Visa-Karte (Kreditkarte)";"Zeitraum: 180 Tage";
+"Neuer Kontostand";"0,00 EUR";
+
+"Wertstellung (Valuta)";"Umsatz in EUR";"Buchungstag";"Vorgang";"Buchungstext";"Umsatztag";"Referenz"
+"10.08.2009";"846,45";"19.02.1980";"Kartenumsatz";"Zehn stehen zusammen liegen weil neu sollen Monat.";"10.08.2009";"awdexfhWsPiVoDLETNyk"
+"16.07.2025";"-3.343,34";"19.07.2000";"Kartenumsatz";"Ihm Wagen Apfel Sommer sechs Rad Finger Wetter.";"16.07.2025";"KDPhAroRFDegPTQBwXZF"
+"21.09.2011";"-3.094,59";"24.02.1998";"Kartenumsatz";"Bauen dick Opa wollen gegen See Tür erklären.";"21.09.2011";"TYCRvkfvRnKAZZHyjMJf"
+"22.11.2019";"2.501,72";"18.09.2023";"Kartenumsatz";"Wiese Tür Beispiel als richtig oft hören Glück.";"22.11.2019";"MRXprlArMtGEOYyrivvb"
+"25.06.1972";"-.797,60";"20.12.2000";"Kartenumsatz";"Minute alt sollen arbeiten Wissen ihn viel hören.";"25.06.1972";"WLNlXtEPMVPWNQinqVoX"
+"23.06.1997";"3.688,65";"24.07.1983";"Kartenumsatz";"Glas sieben Freund bleiben Geld als laufen gelb.";"23.06.1997";"kMtKBlMZfVzaQpFJVrdf"
+"07.08.1970";"236,47";"26.10.2025";"Lastschrift / Belastung";"Können sehr los Klasse gern Glas dabei baden.";"07.08.1970";"XcTWEhERXSrKhTpwxKwq"
+"05.03.1995";"-3.699,34";"28.04.2022";"Lastschrift / Belastung";"Neu traurig damit gar plötzlich Küche kam erzählen.";"05.03.1995";"DCSPqPoExMJVIXDJEmba"
+"13.05.2014";"-2.301,46";"02.02.1993";"Kartenumsatz";"Wiese Blume von verlieren trinken Lehrerin reiten dick.";"13.05.2014";"FyjQDvaDRthPmTPacdcN"
+"12.07.2006";"-1.002,95";"16.06.1990";"Kartenumsatz";"Kam bin frei setzen Lehrer er Schnee ziehen.";"12.07.2006";"CxGyzurWIlEVpidlaHgz"
+"03.01.1989";"-1.538,17";"17.11.2025";"Kartenumsatz";"Merken Geschichte nein sprechen holen kein Stein müde.";"03.01.1989";"LUBzVEGaOaXicGKGRXLK"
+"27.10.1995";"-1.588,75";"09.08.1998";"Kartenumsatz";"Überall genau spielen es dort sechs ich es.";"27.10.1995";"IlEguSkSvqMwjWjgrPJJ"
+"21.05.1976";"771,43";"05.02.2023";"Kartenumsatz";"Schüler früh Tür Dorf traurig er Ende der.";"21.05.1976";"OkireOnJlianvjBgiKLP"
+"10.11.1991";"-3.682,38";"11.12.1976";"Kartenumsatz";"Mädchen der Tag lachen Spaß singen nehmen fangen.";"10.11.1991";"EtrQVskkdZQgaxCnaNuX"
+"27.05.2005";"-2.049,77";"18.05.1992";"Lastschrift / Belastung";"Stehen Stadt kein Stein einige wir dürfen Monate.";"27.05.2005";"yayAivkfmnKnKjaEeqHx"
+"28.09.2009";"2.950,65";"07.10.2017";"Kartenumsatz";"Einfach warm Spaß er wird sonst Seite jung.";"28.09.2009";"xTmXkYMLxHlUWVgzDurB"
+"26.09.1978";"691,87";"09.04.2015";"Kartenumsatz";"Böse zusammen an jung Land spät Brot so.";"26.09.1978";"OZCVRrNQxLzDaTJaYgir"
+"07.01.1986";"1.899,21";"16.06.1975";"Kartenumsatz";"Wird offen ruhig Teller Arbeit sofort bleiben Weihnachten.";"07.01.1986";"YexccmpQrHfXPEaNqjYN"
+"22.11.1970";"-1.088,74";"22.06.1979";"Lastschrift / Belastung";"Kopf Arzt bei jeder krank Haus Haare laut.";"22.11.1970";"uiRZmISGnUnmICslCQKR"
+"06.10.2011";"2.627,51";"06.09.2018";"Lastschrift / Belastung";"Berg Auge auch die Milch packen Junge Bett.";"06.10.2011";"HjQTAhQreZPzYhSlyoDp"
+
+"Alter Kontostand";"0,00 EUR";
+
+"Umsätze Tagesgeld PLUS-Konto";"Zeitraum: 180 Tage";
+"Neuer Kontostand";"1.673,90 EUR";
+
+"Wertstellung (Valuta)";"Umsatz in EUR";"Buchungstag";"Vorgang";"Buchungstext"
+"02.09.2000";"-2.652,98";"13.12.1985";"Lastschrift / Belastung";"Uhr wohl führen See setzen mal krank hoch."
+"27.02.1976";"-2.302,68";"11.05.1997";"Kartenumsatz";"Ohne gut Stein wirklich gar Winter Welt nämlich."
+"28.05.1986";"-3.343,51";"24.04.2026";"Kartenumsatz";"Dich wenig Oma oft denn Ferien hinter halten."
+"18.08.1980";"3.519,25";"08.06.1985";"Lastschrift / Belastung";"Erklären tragen See ging versuchen gern heiß vielleicht."
+"04.10.1981";"3.268,02";"25.07.2014";"Kartenumsatz";"Nein Junge Tier beide noch Wasser hinein gefährlich."
+"09.01.1991";"-3.052,80";"13.06.2023";"Kartenumsatz";"Fisch Schwester viel sicher bis dürfen es Opa."
+"05.07.2011";"-.633,49";"27.04.1994";"Kartenumsatz";"Frei fährt hat mich gleich gibt er Mutter."
+"22.02.2015";"-1.146,44";"16.04.2010";"Lastschrift / Belastung";"Tag stellen in nichts Winter unser Eltern traurig."
+"17.03.1989";"350,28";"24.03.2000";"Kartenumsatz";"Ding fröhlich fangen Herz allein tief weiter ihn."
+"26.10.1994";"3.490,67";"10.05.1988";"Kartenumsatz";"Gibt Zeit Zug doch hören Frau Zimmer Onkel."
+
+"Alter Kontostand";"6.686,20 EUR";
+
+"Umsätze Depot";"Zeitraum: 180 Tage";
+
+"Wertstellung (Valuta)";"Umsatz in EUR";"Geschäftstag";"Stück / Nom.";"Bezeichnung";"WKN";"Währung";"Ausführungskurs"
+"28.10.1974";"1.685,37";"28.10.1974";"3.782,02";"zVQTjfeGndFUgHRYoOJV";"UIKWcmkLpKvlEaxsJNAY";"IVIQpMQspcGkoCQUMKKQ";"-1.169,05"
+"23.03.1994";"1.559,84";"23.03.1994";"-.507,97";"rWidmLRRjtCtJbGCxxiJ";"clkDytzVOZfNqNqNqwpq";"vinALLmPCGosxxYbxQOT";"-.170,74"
+"21.07.1997";"1.885,70";"21.07.1997";"3.199,90";"zbFJlhZJhFyVckyTkbWF";"NCLFEpfFrQAsoRLpEdNB";"BdqBcCsARBsTONKUEMUG";"2.167,34"
+"04.11.2007";"-2.336,08";"04.11.2007";"3.374,10";"UmhrGDbbJhTbtBVnMEWU";"kfrvJSzEonSnYSvSwhzR";"WsyqHHvMGewNQWnQVOab";"-44,87"
+"10.05.1995";"2.777,21";"10.05.1995";"-.466,66";"QBcTBCTJDuIWJKthZKKN";"DOBQNhJNlHjRdTYQfihc";"tTdPJSTffQjGknRiARpp";"1.108,37"
+"02.08.2021";"95,64";"02.08.2021";"-2.473,15";"sURiquSzaJuCrwWdnuBf";"VltMSrMBshpZqfZltkJz";"mDBoFnnxoaMnkJcJwXtE";"1.989,84"
+"08.01.2006";"723,60";"08.01.2006";"-3.788,97";"lENmCDzBnAoOlUWoIEOh";"vsTfHGBstXTwHpVQQIMN";"woeYzPNzwxhbsVuBQSzW";"723,80"
+"24.08.1972";"-2.752,39";"24.08.1972";"121,81";"QmboZenDJYKYJZHrwBzg";"TOOOVZqQAxZLvZBqhttK";"iCRZdDaRZbJzKjDwweZz";"1.508,94"
+"17.10.2004";"-3.983,82";"17.10.2004";"-2.862,12";"tBoMSqznKQiDGPEaZgtK";"KCxxVLPJcUdCHWRHiLuG";"MuwYMYDVjiZdGPPchFan";"2.170,06"
+"13.01.2003";"1.172,75";"13.01.2003";"3.559,62";"DZUeNsJNwFiobKvjqbFE";"lKBJTcOkTowTcbtEDnHC";"DDMOrfHrxGjnjDQplaXe";"515,78"

tests/test_db.py

@@ -1,5 +1,3 @@
-#!/bin/python
-
 from sqlalchemy import inspect
 from sqlalchemy.orm import Session
 

tests/test_db_utils_update_path.py

@@ -0,0 +1,238 @@
+"""Tests for db_utils.py update path in upsert function.
+
+The upsert function has two paths:
+1. Row exists -> either return existing (do_update=False) or update it (do_update=True)
+2. Row doesn't exist -> insert new row
+
+These tests cover the update path (lines 25-26).
+
+NOTE: MYPY errors suppressed for test fixtures - see AGENTS.md for type checking notes.
+"""
+
+from sqlalchemy.orm import Session
+
+from src.db_utils import upsert
+
+
+class TestUpsertUpdatePath:
+    """Tests for the update path in db_utils.upsert."""
+
+    def test_upsert_updates_existing_row(self, db_session: Session):
+        """Test that upsert updates an existing row when do_update=True."""
+        from sqlalchemy import Column, Integer, String
+        from sqlalchemy.orm import declarative_base
+
+        Base = declarative_base()
+
+        class TestModel(Base):
+            __tablename__ = "test_model"
+            id: int = Column(Integer, primary_key=True, autoincrement=True)
+            name: str = Column(String(100), nullable=False)
+            value: str = Column(String(50), nullable=False)
+
+        Base.metadata.create_all(db_session.get_bind())
+
+        # Create and insert a row
+        initial = TestModel(name="initial", value="old_value")
+        db_session.add(initial)
+        db_session.commit()
+
+        # Verify it was inserted
+        result = db_session.query(TestModel).filter_by(name="initial").one()
+        assert result.value == "old_value"
+
+    def test_upsert_skips_update_when_do_update_false(self, db_session: Session):
+        """Test that upsert doesn't modify existing row when do_update=False."""
+        from sqlalchemy import Column, Integer, String
+        from sqlalchemy.orm import declarative_base
+
+        Base = declarative_base()
+
+        class TestModel(Base):
+            __tablename__ = "test_model_2"
+            id: int = Column(Integer, primary_key=True, autoincrement=True)
+            name: str = Column(String(100), nullable=False)
+            value: str = Column(String(50), nullable=False)
+
+        Base.metadata.create_all(db_session.get_bind())
+
+        # Create and insert a row
+        initial = TestModel(name="skip_update", value="original")
+        db_session.add(initial)
+        db_session.commit()
+
+        # Upsert with do_update=False should not modify existing row
+        same_row = TestModel(name="skip_update", value="should_not_change")
+
+        result = upsert(
+            db_session,
+            TestModel,
+            {"name": "skip_update"},
+            same_row.__dict__,
+            do_update=False,
+            do_commit=True,
+        )
+
+        # The row should still have original values
+        assert result.value == "original"
+
+    def test_upsert_updates_and_returns_existing(self, db_session: Session):
+        """Test that upsert returns the existing (now updated) row when do_update=True."""
+        from sqlalchemy import Column, Integer, String
+        from sqlalchemy.orm import declarative_base
+
+        Base = declarative_base()
+
+        class TestModel(Base):
+            __tablename__ = "test_model_3"
+            id: int = Column(Integer, primary_key=True, autoincrement=True)
+            name: str = Column(String(100), nullable=False)
+            value: str = Column(String(50), nullable=False)
+
+        Base.metadata.create_all(db_session.get_bind())
+
+        # Create and insert a row
+        initial = TestModel(name="update_test", value="old")
+        db_session.add(initial)
+        db_session.commit()
+
+        # Upsert with do_update=True should update and return the same object
+        new_values = TestModel(name="update_test", value="new_value")
+
+        result = upsert(
+            db_session,
+            TestModel,
+            {"name": "update_test"},
+            new_values.__dict__,
+            do_update=True,
+            do_commit=True,
+        )
+
+        # Result should be the same row (not a new one)
+        assert result is not None
+        # Should have updated values
+        assert result.value == "new_value"
+
+    def test_upsert_returns_updated_row_by_value_when_not_same_object(
+        self, db_session: Session
+    ):
+        """Test update path when the returned row is same by identity (session cache)."""
+        from sqlalchemy import Column, Integer, String
+        from sqlalchemy.orm import declarative_base
+
+        Base = declarative_base()
+
+        class TestModel(Base):
+            __tablename__ = "test_model_4"
+            id: int = Column(Integer, primary_key=True, autoincrement=True)
+            name: str = Column(String(100), nullable=False)
+            value: str = Column(String(50), nullable=False)
+
+        Base.metadata.create_all(db_session.get_bind())
+
+        # Create and insert a row
+        initial = TestModel(name="identity_test", value="initial")
+        db_session.add(initial)
+        db_session.commit()
+
+        # Get the row from DB again (fresh load)
+        before_update = (
+            db_session.query(TestModel).filter_by(name="identity_test").one()
+        )
+
+        # Now upsert should return same object due to session cache + identity map
+        new_values = TestModel(name="identity_test", value="updated")
+
+        result = upsert(
+            db_session,
+            TestModel,
+            {"name": "identity_test"},
+            new_values.__dict__,
+            do_update=True,
+            do_commit=False,
+        )  # don't commit yet
+
+        # Should be same identity due to session cache
+        assert result is before_update
+        assert result.value == "updated"
+
+
+class TestUpsertUpdateEdgeCases:
+    """Test edge cases for the update path."""
+
+    def test_upsert_partial_update(self, db_session: Session):
+        """Test that only specified fields are updated."""
+        from sqlalchemy import Column, Integer, String
+        from sqlalchemy.orm import declarative_base
+
+        Base = declarative_base()
+
+        class TestModel(Base):
+            __tablename__ = "test_model_5"
+            id: int = Column(Integer, primary_key=True, autoincrement=True)
+            name: str = Column(String(100), nullable=False)
+            value: str = Column(String(50), nullable=False)
+            extra: str = Column(String(50), nullable=False)
+
+        Base.metadata.create_all(db_session.get_bind())
+
+        # Create and insert a row with all fields
+        initial = TestModel(
+            name="partial", value="original_value", extra="extra_original"
+        )
+        db_session.add(initial)
+        db_session.commit()
+
+        # Create new values with only some fields set (note: we skip 'extra' field)
+        partial_update = TestModel(name="partial", value="new_value", extra=None)
+
+        result = upsert(
+            db_session,
+            TestModel,
+            {"name": "partial"},
+            partial_update.__dict__,
+            do_update=True,
+            do_commit=True,
+        )
+
+        # value should be updated since it was in the dict
+        assert result.value == "new_value"
+        # extra field handling depends on what's in the __dict__
+
+
+class TestUpsertUpdateEmptyDict:
+    """Test edge case of empty update dictionary."""
+
+    def test_upsert_with_empty_update_dict(self, db_session: Session):
+        """Test upsert with empty parameters_new dict - should still work if existing found."""
+        from sqlalchemy import Column, Integer, String
+        from sqlalchemy.orm import declarative_base
+
+        Base = declarative_base()
+
+        class TestModel(Base):
+            __tablename__ = "test_model_6"
+            id: int = Column(Integer, primary_key=True, autoincrement=True)
+            name: str = Column(String(100), nullable=False)
+            value: str = Column(String(50), nullable=False)
+
+        Base.metadata.create_all(db_session.get_bind())
+
+        # Create and insert a row
+        initial = TestModel(name="empty_dict", value="test")
+        db_session.add(initial)
+        db_session.commit()
+
+        # Try to upsert with empty new parameters (edge case)
+        result = upsert(
+            db_session,
+            TestModel,
+            {"name": "empty_dict"},
+            {},
+            do_update=True,
+            do_commit=False,
+        )
+
+        # Should return the existing row unchanged
+        assert result is not None
+        assert result.name == "empty_dict"

tests/test_domain_utils_budget_overlap.py

@@ -0,0 +1,736 @@
+"""Comprehensive tests for set_category_budget overlap handling."""
+
+from datetime import UTC, date, datetime
+
+import pytest
+from sqlalchemy.orm import Session
+
+from src.domain_utils import find_category_db, set_category_budget
+from src.models import Category, CategoryBudget, CategoryBudgetDb
+from src.models.category import CategoryDb, upsert_category
+from tests.factories import CategoryFactory
+
+# NOTE: MYPY errors suppressed for test fixtures - see AGENTS.md for type checking notes.
+
+
+class TestSetCategoryBudgetNoOverlap:
+    """Test budgets that don't overlap with existing ones."""
+
+    def test_no_overlap_add_new(self, db_session: Session):
+        """When new budget has no overlap with existing, add both."""
+        cat = CategoryFactory.build()
+        cat_db = upsert_category(db_session, cat, do_commit=False)
+        db_session.commit()
+
+        # First budget: Oct 1 - Nov 30
+        budget1 = CategoryBudget(
+            category=cat,
+            amount_eur=100.00,
+            valid_from=date(2026, 10, 1),
+            valid_to=date(2026, 11, 30),
+        )
+        set_category_budget(db_session, budget1)
+
+        # Second budget: Dec 1 - Dec 31 (no overlap with Oct-Nov range)
+        budget2 = CategoryBudget(
+            category=cat,
+            amount_eur=150.00,
+            valid_from=date(2026, 12, 1),
+            valid_to=date(2026, 12, 31),
+        )
+        set_category_budget(db_session, budget2)
+
+        budgets = list(
+            db_session.query(CategoryBudgetDb).filter_by(category_id=cat_db.id)
+        )
+        assert len(budgets) == 2
+
+    def test_completely_before_no_overlap(self, db_session: Session):
+        """New budget completely before existing - should add both."""
+        cat = CategoryFactory.build()
+        cat_db = upsert_category(db_session, cat, do_commit=False)
+        db_session.commit()
+
+        # Existing budget covering Oct 15 - Dec 30
+        existing_budget = CategoryBudget(
+            category=cat,
+            amount_eur=100.00,
+            valid_from=date(2026, 10, 15),
+            valid_to=date(2026, 12, 30),
+        )
+        set_category_budget(db_session, existing_budget)
+
+        # New budget covering Sep 1 - Sep 30 (completely before)
+        new_budget = CategoryBudget(
+            category=cat,
+            amount_eur=50.00,
+            valid_from=date(2026, 9, 1),
+            valid_to=date(2026, 9, 30),
+        )
+        set_category_budget(db_session, new_budget)
+
+        budgets = list(
+            db_session.query(CategoryBudgetDb).filter_by(category_id=cat_db.id)
+        )
+        assert len(budgets) == 2
+
+
+class TestSetCategoryBudgetFullOverlap:
+    """Test when new budget fully overlaps existing."""
+
+    def test_full_overlap_replace(self, db_session: Session):
+        """When new budget fully overlaps existing, replace entirely."""
+        cat = CategoryFactory.build()
+        cat_db = upsert_category(db_session, cat, do_commit=False)
+        db_session.commit()
+
+        # Existing budget covering Oct 1 - Nov 30
+        existing_budget = CategoryBudget(
+            category=cat,
+            amount_eur=100.00,
+            valid_from=date(2026, 10, 1),
+            valid_to=date(2026, 11, 30),
+        )
+        set_category_budget(db_session, existing_budget)
+
+        # New budget covering Oct 1 - Nov 30 (same range, different amount)
+        new_budget = CategoryBudget(
+            category=cat,
+            amount_eur=200.00,
+            valid_from=date(2026, 10, 1),
+            valid_to=date(2026, 11, 30),
+        )
+        set_category_budget(db_session, new_budget)
+
+        budgets = list(
+            db_session.query(CategoryBudgetDb).filter_by(category_id=cat_db.id)
+        )
+        # Should have only 1 budget with the new amount (replaced old one)
+        assert len(budgets) == 1
+        assert budgets[0].amount_eur == 200.00
+
+
+class TestSetCategoryBudgetPartialOverlapStart:
+    """Test partial overlap where new budget overlaps at start."""
+
+    def test_partial_overlap_at_start(self, db_session: Session):
+        """When new budget overlaps existing from the start, keep end and cut before."""
+        cat = CategoryFactory.build()
+        cat_db = upsert_category(db_session, cat, do_commit=False)
+        db_session.commit()
+
+        # Existing budget covering Oct 1 - Nov 30
+        existing_budget = CategoryBudget(
+            category=cat,
+            amount_eur=100.00,
+            valid_from=date(2026, 10, 1),
+            valid_to=date(2026, 11, 30),
+        )
+        set_category_budget(db_session, existing_budget)
+
+        # New budget covering Oct 1 - Nov 15 (overlaps from start)
+        new_budget = CategoryBudget(
+            category=cat,
+            amount_eur=120.00,
+            valid_from=date(2026, 10, 1),
+            valid_to=date(2026, 11, 15),
+        )
+        set_category_budget(db_session, new_budget)
+
+        # Should have 2 budgets:
+        # 1. Oct 1 - Nov 15 (new budget)
+        # 2. Dec 1 - Dec 30 (remainder from old budget, after overlap end + 1 day)
+        budgets = list(
+            db_session.query(CategoryBudgetDb).filter_by(category_id=cat_db.id)
+        )
+        assert len(budgets) == 2
+
+
+class TestSetCategoryBudgetPartialOverlapEnd:
+    """Test partial overlap where new budget overlaps at end."""
+
+    def test_partial_overlap_at_end(self, db_session: Session):
+        """When new budget overlaps existing at the end, keep start and cut after."""
+        cat = CategoryFactory.build()
+        cat_db = upsert_category(db_session, cat, do_commit=False)
+        db_session.commit()
+
+        # Existing budget covering Oct 1 - Nov 30
+        existing_budget = CategoryBudget(
+            category=cat,
+            amount_eur=100.00,
+            valid_from=date(2026, 10, 1),
+            valid_to=date(2026, 11, 30),
+        )
+        set_category_budget(db_session, existing_budget)
+
+        # New budget covering Oct 15 - Nov 30 (overlaps at end)
+        new_budget = CategoryBudget(
+            category=cat,
+            amount_eur=120.00,
+            valid_from=date(2026, 10, 15),
+            valid_to=date(2026, 11, 30),
+        )
+        set_category_budget(db_session, new_budget)
+
+        # Should have 2 budgets:
+        # 1. Oct 1 - Oct 14 (remainder from old budget, before overlap start - 1 day)
+        # 2. Oct 15 - Nov 30 (new budget)
+        budgets = list(
+            db_session.query(CategoryBudgetDb).filter_by(category_id=cat_db.id)
+        )
+        assert len(budgets) == 2
+
+
+class TestSetCategoryBudgetMiddleOverlap:
+    """Test overlap in the middle that splits existing budget."""
+
+    def test_complex_overlap_middle(self, db_session: Session):
+        """Handle overlap in the middle that splits existing budget into two parts."""
+        cat = CategoryFactory.build()
+        cat_db = upsert_category(db_session, cat, do_commit=False)
+        db_session.commit()
+
+        # Existing budget covering Oct 1 - Dec 31
+        existing_budget = CategoryBudget(
+            category=cat,
+            amount_eur=100.00,
+            valid_from=date(2026, 10, 1),
+            valid_to=date(2026, 12, 31),
+        )
+        set_category_budget(db_session, existing_budget)
+
+        # New budget covering Oct 15 - Nov 30 (overlaps in middle)
+        new_budget = CategoryBudget(
+            category=cat,
+            amount_eur=150.00,
+            valid_from=date(2026, 10, 15),
+            valid_to=date(2026, 11, 30),
+        )
+        set_category_budget(db_session, new_budget)
+
+        # Should have 3 budgets:
+        # 1. Oct 1 - Oct 14 (before new range, original amount)
+        # 2. Oct 15 - Nov 30 (new budget, new amount)
+        # 3. Dec 1 - Dec 31 (after new range, original amount)
+        budgets = list(
+            db_session.query(CategoryBudgetDb).filter_by(category_id=cat_db.id)
+        )
+        assert len(budgets) == 3
+
+
+class TestSetCategoryBudgetUnbounded:
+    """Test budgets with unbounded dates."""
+
+    def test_unbounded_start(self, db_session: Session):
+        """Budget with None valid_from (unbounded start)."""
+        cat = CategoryFactory.build()
+        cat_db = upsert_category(db_session, cat, do_commit=False)
+        db_session.commit()
+
+        budget = CategoryBudget(
+            category=cat,
+            amount_eur=100.00,
+            valid_from=None,  # Unbounded start
+            valid_to=date(2026, 12, 31),
+        )
+        set_category_budget(db_session, budget)
+
+        budgets = list(
+            db_session.query(CategoryBudgetDb).filter_by(category_id=cat_db.id)
+        )
+        assert len(budgets) == 1
+        assert budgets[0].valid_from is None
+        assert budgets[0].valid_to == date(2026, 12, 31)
+
+    def test_unbounded_end(self, db_session: Session):
+        """Budget with None valid_to (unbounded end)."""
+        cat = CategoryFactory.build()
+        cat_db = upsert_category(db_session, cat, do_commit=False)
+        db_session.commit()
+
+        budget = CategoryBudget(
+            category=cat,
+            amount_eur=100.00,
+            valid_from=date(2026, 10, 1),
+            valid_to=None,  # Unbounded end
+        )
+        set_category_budget(db_session, budget)
+
+        budgets = list(
+            db_session.query(CategoryBudgetDb).filter_by(category_id=cat_db.id)
+        )
+        assert len(budgets) == 1
+        assert budgets[0].valid_from == date(2026, 10, 1)
+        assert budgets[0].valid_to is None
+
+    def test_unbounded_both(self, db_session: Session):
+        """Budget with both dates unbounded (None)."""
+        cat = CategoryFactory.build()
+        cat_db = upsert_category(db_session, cat, do_commit=False)
+        db_session.commit()
+
+        budget = CategoryBudget(
+            category=cat,
+            amount_eur=100.00,
+            valid_from=None,  # Unbounded start
+            valid_to=None,  # Unbounded end
+        )
+        set_category_budget(db_session, budget)
+
+        budgets = list(
+            db_session.query(CategoryBudgetDb).filter_by(category_id=cat_db.id)
+        )
+        assert len(budgets) == 1
+        assert budgets[0].valid_from is None
+        assert budgets[0].valid_to is None
+
+
+class TestSetCategoryBudgetWithExistingUnbounded:
+    """Test adding bounded budgets to categories with existing unbounded budgets."""
+
+    def test_add_bounded_after_unbounded(self, db_session: Session):
+        """Add a bounded budget after an unbounded one (no overlap)."""
+        cat = CategoryFactory.build()
+        cat_db = upsert_category(db_session, cat, do_commit=False)
+        db_session.commit()
+
+        # First, add unbounded budget
+        unbounded_budget = CategoryBudget(
+            category=cat,
+            amount_eur=100.00,
+            valid_from=None,
+            valid_to=None,
+        )
+        set_category_budget(db_session, unbounded_budget)
+
+        # Add bounded budget after (Nov 1 - Dec 31)
+        bounded_budget = CategoryBudget(
+            category=cat,
+            amount_eur=150.00,
+            valid_from=date(2026, 11, 1),
+            valid_to=date(2026, 12, 31),
+        )
+        set_category_budget(db_session, bounded_budget)
+
+        budgets = list(
+            db_session.query(CategoryBudgetDb).filter_by(category_id=cat_db.id)
+        )
+        assert len(budgets) == 2
+
+    def test_add_bounded_before_unbounded(self, db_session: Session):
+        """Add a bounded budget before an unbounded one (no overlap)."""
+        cat = CategoryFactory.build()
+        cat_db = upsert_category(db_session, cat, do_commit=False)
+        db_session.commit()
+
+        # First, add unbounded budget
+        unbounded_budget = CategoryBudget(
+            category=cat,
+            amount_eur=100.00,
+            valid_from=None,
+            valid_to=None,
+        )
+        set_category_budget(db_session, unbounded_budget)
+
+        # Add bounded budget before (Sep 1 - Oct 31)
+        bounded_budget = CategoryBudget(
+            category=cat,
+            amount_eur=75.00,
+            valid_from=date(2026, 9, 1),
+            valid_to=date(2026, 10, 31),
+        )
+        set_category_budget(db_session, bounded_budget)
+
+        budgets = list(
+            db_session.query(CategoryBudgetDb).filter_by(category_id=cat_db.id)
+        )
+        assert len(budgets) == 2
+
+
+class TestSetCategoryBudgetMultipleWithSameAmount:
+    """Test multiple budgets with same amount and overlapping dates."""
+
+    def test_same_range_different_amount(self, db_session: Session):
+        """When two budgets have same range but different amounts, only one should remain."""
+        cat = CategoryFactory.build()
+        cat_db = upsert_category(db_session, cat, do_commit=False)
+        db_session.commit()
+
+        # First budget
+        budget1 = CategoryBudget(
+            category=cat,
+            amount_eur=100.00,
+            valid_from=date(2026, 10, 1),
+            valid_to=date(2026, 11, 30),
+        )
+        set_category_budget(db_session, budget1)
+
+        # Same range but different amount
+        budget2 = CategoryBudget(
+            category=cat,
+            amount_eur=200.00,
+            valid_from=date(2026, 10, 1),
+            valid_to=date(2026, 11, 30),
+        )
+        set_category_budget(db_session, budget2)
+
+        budgets = list(
+            db_session.query(CategoryBudgetDb).filter_by(category_id=cat_db.id)
+        )
+        assert len(budgets) == 1
+        assert budgets[0].amount_eur == 200.00
+
+
+class TestSetCategoryBudgetDateEdgeCases:
+    """Test edge cases around date boundaries."""
+
+    def test_adjacent_budgets_no_overlap(self, db_session: Session):
+        """Two budgets that are adjacent (end of one is start-1 of next) should both exist."""
+        cat = CategoryFactory.build()
+        cat_db = upsert_category(db_session, cat, do_commit=False)
+        db_session.commit()
+
+        # Budget 1: Oct 1 - Oct 31
+        budget1 = CategoryBudget(
+            category=cat,
+            amount_eur=100.00,
+            valid_from=date(2026, 10, 1),
+            valid_to=date(2026, 10, 31),
+        )
+        set_category_budget(db_session, budget1)
+
+        # Budget 2: Nov 1 - Nov 30 (adjacent to Oct 31)
+        budget2 = CategoryBudget(
+            category=cat,
+            amount_eur=100.00,
+            valid_from=date(2026, 11, 1),
+            valid_to=date(2026, 11, 30),
+        )
+        set_category_budget(db_session, budget2)
+
+        budgets = list(
+            db_session.query(CategoryBudgetDb).filter_by(category_id=cat_db.id)
+        )
+        assert len(budgets) == 2
+
+    def test_shared_endpoint_is_replaced(self, db_session: Session):
+        """Inclusive ranges that share a date must not overlap after replacement."""
+        cat = CategoryFactory.build()
+        cat_db = upsert_category(db_session, cat, do_commit=False)
+        db_session.commit()
+
+        set_category_budget(
+            db_session,
+            CategoryBudget(
+                category=cat,
+                amount_eur=100.00,
+                valid_from=date(2026, 10, 1),
+                valid_to=date(2026, 10, 15),
+            ),
+        )
+        set_category_budget(
+            db_session,
+            CategoryBudget(
+                category=cat,
+                amount_eur=200.00,
+                valid_from=date(2026, 10, 15),
+                valid_to=date(2026, 10, 31),
+            ),
+        )
+
+        budgets = (
+            db_session.query(CategoryBudgetDb)
+            .filter_by(category_id=cat_db.id)
+            .order_by(CategoryBudgetDb.valid_from)
+            .all()
+        )
+        assert [(b.amount_eur, b.valid_from, b.valid_to) for b in budgets] == [
+            (100.00, date(2026, 10, 1), date(2026, 10, 14)),
+            (200.00, date(2026, 10, 15), date(2026, 10, 31)),
+        ]
+
+
+class TestSetCategoryBudgetRegressionCases:
+    def test_new_range_overlapping_multiple_budgets_is_added_once(
+        self, db_session: Session
+    ):
+        cat = CategoryFactory.build()
+        cat_db = upsert_category(db_session, cat, do_commit=False)
+        db_session.commit()
+
+        for start, end, amount in (
+            (date(2026, 10, 1), date(2026, 10, 31), 100.00),
+            (date(2026, 12, 1), date(2026, 12, 31), 200.00),
+        ):
+            set_category_budget(
+                db_session,
+                CategoryBudget(
+                    category=cat,
+                    amount_eur=amount,
+                    valid_from=start,
+                    valid_to=end,
+                ),
+            )
+
+        set_category_budget(
+            db_session,
+            CategoryBudget(
+                category=cat,
+                amount_eur=300.00,
+                valid_from=date(2026, 10, 1),
+                valid_to=date(2026, 12, 31),
+            ),
+        )
+
+        budgets = (
+            db_session.query(CategoryBudgetDb).filter_by(category_id=cat_db.id).all()
+        )
+        assert len(budgets) == 1
+        assert budgets[0].amount_eur == 300.00
+        assert budgets[0].valid_from == date(2026, 10, 1)
+        assert budgets[0].valid_to == date(2026, 12, 31)
+
+    @pytest.mark.parametrize(
+        ("existing_start", "existing_end", "new_start", "new_end", "expected"),
+        [
+            (
+                date(2026, 10, 1),
+                date(2026, 12, 31),
+                None,
+                date(2026, 11, 15),
+                [
+                    (100.00, date(2026, 11, 16), date(2026, 12, 31)),
+                    (200.00, None, date(2026, 11, 15)),
+                ],
+            ),
+            (
+                date(2026, 10, 1),
+                date(2026, 12, 31),
+                date(2026, 11, 15),
+                None,
+                [
+                    (100.00, date(2026, 10, 1), date(2026, 11, 14)),
+                    (200.00, date(2026, 11, 15), None),
+                ],
+            ),
+            (
+                None,
+                date(2026, 12, 31),
+                date(2026, 10, 1),
+                date(2026, 10, 31),
+                [
+                    (100.00, None, date(2026, 9, 30)),
+                    (200.00, date(2026, 10, 1), date(2026, 10, 31)),
+                    (100.00, date(2026, 11, 1), date(2026, 12, 31)),
+                ],
+            ),
+            (
+                date(2026, 10, 1),
+                None,
+                date(2026, 11, 1),
+                date(2026, 11, 30),
+                [
+                    (100.00, date(2026, 10, 1), date(2026, 10, 31)),
+                    (200.00, date(2026, 11, 1), date(2026, 11, 30)),
+                    (100.00, date(2026, 12, 1), None),
+                ],
+            ),
+        ],
+    )
+    def test_partially_unbounded_ranges_are_split_correctly(
+        self,
+        db_session: Session,
+        existing_start: date | None,
+        existing_end: date | None,
+        new_start: date | None,
+        new_end: date | None,
+        expected: list[tuple[float, date | None, date | None]],
+    ):
+        cat = CategoryFactory.build()
+        cat_db = upsert_category(db_session, cat, do_commit=False)
+        db_session.commit()
+
+        set_category_budget(
+            db_session,
+            CategoryBudget(
+                category=cat,
+                amount_eur=100.00,
+                valid_from=existing_start,
+                valid_to=existing_end,
+            ),
+        )
+        set_category_budget(
+            db_session,
+            CategoryBudget(
+                category=cat,
+                amount_eur=200.00,
+                valid_from=new_start,
+                valid_to=new_end,
+            ),
+        )
+
+        budgets = (
+            db_session.query(CategoryBudgetDb).filter_by(category_id=cat_db.id).all()
+        )
+        actual = {(float(b.amount_eur), b.valid_from, b.valid_to) for b in budgets}
+        assert actual == set(expected)
+
+
+class TestFindCategoryDb:
+    """Test find_category_db function."""
+
+    def test_find_simple(self, db_session: Session):
+        """Find a simple category without parent."""
+        cat = Category(name="SimpleCategory")
+        upsert_category(db_session, cat, do_commit=False)
+        db_session.commit()
+
+        result = find_category_db(db_session, cat)
+        assert result is not None
+        assert str(result.name) == "SimpleCategory"
+
+    def test_find_with_parent_hierarchy(self, db_session: Session):
+        """Find a category with parent hierarchy."""
+        grandfather = Category(name="grandfather")
+        upsert_category(db_session, grandfather, do_commit=False)
+        db_session.commit()
+
+        father = Category(name="father", parent=grandfather)
+        upsert_category(db_session, father, do_commit=False)
+        db_session.commit()
+
+        child = Category(name="child", parent=father)
+        upsert_category(db_session, child, do_commit=False)
+        db_session.commit()
+
+        # Find the child via find_category_db
+        result = find_category_db(db_session, child)
+        assert result is not None
+        assert str(result.parent.name) == "father"
+
+    def test_find_nonexistent(self, db_session: Session):
+        """Return None for non-existent category."""
+        # Create a category but don't add it to session (already in memory from fixtures)
+        result = find_category_db(db_session, Category(name="NonExistent"))
+        assert result is None
+
+    def test_find_reintroduced_category_returns_active_version(
+        self, db_session: Session
+    ):
+        category = Category(name="Reintroduced")
+        historical = CategoryDb(
+            name=category.name,
+            valid_to=datetime(2026, 1, 1, tzinfo=UTC),
+            last_action="retired",
+        )
+        db_session.add(historical)
+        db_session.commit()
+
+        active = upsert_category(db_session, category, do_commit=False)
+        assert active is not None
+        db_session.commit()
+
+        result = find_category_db(db_session, category)
+        assert result is not None
+        assert result.id == active.id
+
+        set_category_budget(
+            db_session,
+            CategoryBudget(category=category, amount_eur=100.00),
+        )
+        budget = db_session.query(CategoryBudgetDb).one()
+        assert budget.category_id == active.id
+
+
+class TestSetCategoryBudgetErrorHandling:
+    """Test error handling in set_category_budget."""
+
+    def test_missing_category_raises_error(self, db_session: Session):
+        """set_category_budget should raise ValueError for missing category."""
+        cat = Category(name="NonExistent")
+        budget = CategoryBudget(
+            category=cat,
+            amount_eur=100.00,
+            valid_from=date(2026, 10, 1),
+            valid_to=date(2026, 10, 31),
+        )
+
+        with pytest.raises(ValueError) as exc_info:
+            set_category_budget(db_session, budget)
+
+        assert "NonExistent" in str(exc_info.value)
+
+    def test_missing_parent_raises_error(self, db_session: Session):
+        """set_category_budget should raise ValueError for missing parent."""
+        cat = Category(name="ChildOfMissing")
+        budget = CategoryBudget(
+            category=cat,
+            amount_eur=100.00,
+            valid_from=date(2026, 10, 1),
+            valid_to=date(2026, 10, 31),
+        )
+
+        with pytest.raises(ValueError) as exc_info:
+            set_category_budget(db_session, budget)
+
+        # The error should mention that the category was not found (including its parent)
+        assert (
+            "ChildOfMissing" in str(exc_info.value).lower()
+            or "not found" in str(exc_info.value).lower()
+            or "no matching" in str(exc_info.value).lower()
+        )
+
+
+class TestSetCategoryBudgetValidation:
+    """Test CategoryBudget model validation rules."""
+
+    def test_valid_budget_no_dates(self):
+        """Budget with None dates is valid."""
+        cat = CategoryFactory.build()
+        budget = CategoryBudget(
+            category=cat,
+            amount_eur=100.00,
+        )
+        assert budget.valid_from is None
+        assert budget.valid_to is None
+
+    def test_valid_budget_with_dates(self):
+        """Budget with dates is valid."""
+        cat = CategoryFactory.build()
+        budget = CategoryBudget(
+            category=cat,
+            amount_eur=100.00,
+            valid_from=date(2026, 10, 1),
+            valid_to=date(2026, 11, 30),
+        )
+        assert budget.valid_from == date(2026, 10, 1)
+        assert budget.valid_to == date(2026, 11, 30)
+
+    def test_invalid_date_range_raises(self):
+        """Budget with valid_from > valid_to should raise validation error."""
+        cat = CategoryFactory.build()
+
+        with pytest.raises(ValueError) as exc_info:
+            CategoryBudget(
+                category=cat,
+                amount_eur=100.00,
+                valid_from=date(2026, 11, 30),
+                valid_to=date(2026, 10, 1),
+            )
+
+        assert "valid_from" in str(exc_info.value) or "valid_to" in str(exc_info.value)
+
+    def test_amount_must_be_positive(self):
+        """Amount must be greater than zero."""
+        cat = CategoryFactory.build()
+
+        with pytest.raises(ValueError) as exc_info:
+            CategoryBudget(
+                category=cat,
+                amount_eur=-100.00,
+                valid_from=date(2026, 10, 1),
+                valid_to=date(2026, 11, 30),
+            )
+
+        assert "greater than" in str(exc_info.value).lower()

tests/test_extract_categories.py

@@ -0,0 +1,125 @@
+"""Tests for extract_categories.py - extracting unique categories from b4w CSV exports."""
+
+import csv
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).parent.parent / "scripts"))
+
+from scripts.initial_load.categories.extract_categories import extract_unique_categories
+
+
+def write_csv(path: Path, categories: list[str]) -> None:
+    with open(path, "w", encoding="utf-8") as f:
+        writer = csv.DictWriter(f, fieldnames=["Id", "AcctId", "Category"])
+        writer.writeheader()
+        for i, category in enumerate(categories, 1):
+            writer.writerow({"Id": str(i), "AcctId": "587713594", "Category": category})
+
+
+def read_lines(path: Path) -> list[str]:
+    return path.read_text(encoding="utf-8").splitlines()
+
+
+def test_extract_unique_categories_basic(tmp_path):
+    csv_file = tmp_path / "input.csv"
+    output_file = tmp_path / "categories.txt"
+    write_csv(csv_file, ["Girokonto:Lebenshaltung", "Girokonto:Sparen"])
+
+    result = extract_unique_categories(str(csv_file), str(output_file))
+
+    assert result == ["Girokonto:Lebenshaltung", "Girokonto:Sparen"]
+    assert read_lines(output_file) == ["Girokonto:Lebenshaltung", "Girokonto:Sparen"]
+
+
+def test_extract_unique_categories_no_duplicates(tmp_path):
+    csv_file = tmp_path / "input.csv"
+    output_file = tmp_path / "categories.txt"
+    write_csv(
+        csv_file,
+        ["Girokonto:Lebenshaltung", "Girokonto:Sparen", "Girokonto:Lebenshaltung"],
+    )
+
+    extract_unique_categories(str(csv_file), str(output_file))
+
+    assert len(read_lines(output_file)) == 2
+
+
+def test_extract_unique_categories_output_format(tmp_path):
+    csv_file = tmp_path / "input.csv"
+    output_file = tmp_path / "categories.txt"
+    write_csv(
+        csv_file,
+        ["Girokonto:Lebenshaltung", "Girokonto:Sparen", "Girokonto:Privat"],
+    )
+
+    extract_unique_categories(str(csv_file), str(output_file))
+
+    lines = read_lines(output_file)
+    assert len(lines) == 3
+    # Plain list: no numbering prefix, no blank lines.
+    assert all(line == line.strip() and not line[0].isdigit() for line in lines)
+
+
+def test_extract_unique_categories_german_special_chars(tmp_path):
+    csv_file = tmp_path / "input.csv"
+    output_file = tmp_path / "categories.txt"
+    write_csv(
+        csv_file,
+        ["Girokonto:Freizeit:Urlaub&Ausflüge", "Girokonto:Privat:Mitgliedsbeiträge"],
+    )
+
+    extract_unique_categories(str(csv_file), str(output_file))
+
+    assert read_lines(output_file) == [
+        "Girokonto:Freizeit:Urlaub&Ausflüge",
+        "Girokonto:Privat:Mitgliedsbeiträge",
+    ]
+
+
+def test_extract_unique_categories_handles_empty_csv(tmp_path):
+    csv_file = tmp_path / "input.csv"
+    output_file = tmp_path / "categories.txt"
+    csv_file.write_text("Id,AcctId,Category\n", encoding="utf-8")
+
+    extract_unique_categories(str(csv_file), str(output_file))
+
+    assert output_file.exists()
+    assert read_lines(output_file) == []
+
+
+def test_extract_unique_categories_handles_csv_with_all_empty_categories(tmp_path):
+    csv_file = tmp_path / "input.csv"
+    output_file = tmp_path / "categories.txt"
+    csv_file.write_text(
+        "Id,AcctId,Category\n1,587713594,\n2,587713594,\n3,587713594,\n",
+        encoding="utf-8",
+    )
+
+    extract_unique_categories(str(csv_file), str(output_file))
+
+    assert read_lines(output_file) == []
+
+
+def test_extract_unique_categories_rerun_is_idempotent(tmp_path):
+    csv_file = tmp_path / "input.csv"
+    output_file = tmp_path / "categories.txt"
+    write_csv(csv_file, ["Girokonto:Lebenshaltung", "Girokonto:Sparen"])
+
+    extract_unique_categories(str(csv_file), str(output_file))
+    first_run = read_lines(output_file)
+
+    # A new category appears in the CSV on the second run.
+    write_csv(
+        csv_file, ["Girokonto:Lebenshaltung", "Girokonto:Sparen", "Girokonto:Privat"]
+    )
+    extract_unique_categories(str(csv_file), str(output_file))
+    second_run = read_lines(output_file)
+
+    # Existing entries are merged, not duplicated; list stays sorted and plain.
+    assert second_run == [
+        "Girokonto:Lebenshaltung",
+        "Girokonto:Privat",
+        "Girokonto:Sparen",
+    ]
+    assert first_run == ["Girokonto:Lebenshaltung", "Girokonto:Sparen"]

tests/test_helper_db.py

@@ -1,34 +1,132 @@
-#!/bin/python
+from datetime import UTC, datetime
 
+import pytest
 from sqlalchemy import select
+from sqlalchemy.exc import IntegrityError
 from sqlalchemy.orm import Session
 
-from src.helper_db import upsert_category
+from src.ingest.b4w import change_category, retire_category, upsert_category
 from src.models import Category
-from src.models_db import CategoryDb
+from src.models.b4w import CategoryDb
 
 
 def test_upsert_category_returns_orm_object(db_session: Session):
-    result = upsert_category(db_session, Category.from_str("dummy_parent_1:dummy_parent_2:dummy"), do_commit=False)
+    result = upsert_category(
+        db_session,
+        Category.from_str("dummy_parent_1:dummy_parent_2:dummy"),
+        do_commit=False,
+    )
     assert result
     assert isinstance(result, CategoryDb)
     assert str(result.name) == "dummy"
     assert str(result.parent.name) == "dummy_parent_2"
     assert str(result.parent.parent.name) == "dummy_parent_1"
+    assert result.valid_from is None
+    assert result.valid_to is None
+    assert result.last_action == "created"
+    assert all(
+        CategoryDb.__table__.c[name].info.get("description")
+        for name in ("valid_from", "valid_to", "last_action")
+    )
+
 
 def test_upsert_category_writes_new_to_db(db_session: Session):
-    upsert_category(db_session, Category.from_str("grand_father:father:new_category"), do_commit=True)
+    upsert_category(
-    result = db_session.execute(select(CategoryDb).filter_by(name="new_category")).scalar_one()
+        db_session,
+        Category.from_str("grand_father:father:new_category"),
+        do_commit=True,
+    )
+    result = db_session.execute(
+        select(CategoryDb).filter_by(name="new_category")
+    ).scalar_one()
     assert result
-    assert str( result.name ) == "new_category"
+    assert str(result.name) == "new_category"
-    assert str( result.parent.name ) == "father"
+    assert str(result.parent.name) == "father"
-    assert str( result.parent.parent.name ) == "grand_father"
+    assert str(result.parent.parent.name) == "grand_father"
+
 
 def test_upsert_category_skips_existing(db_session: Session):
     for _ in range(3):
-        upsert_category(db_session, Category.from_str("grand_father:father:try_again_and_again"), do_commit=True)
+        upsert_category(
-    result = db_session.execute(select(CategoryDb).filter_by(name="try_again_and_again")).all()
+            db_session,
+            Category.from_str("grand_father:father:try_again_and_again"),
+            do_commit=True,
+        )
+    result = db_session.execute(
+        select(CategoryDb).filter_by(name="try_again_and_again")
+    ).all()
     assert len(result) == 1
 
 
+def test_change_category_closes_old_version_and_starts_new_one(
+    db_session: Session,
+):
+    original = upsert_category(
+        db_session, Category.from_str("old_category"), do_commit=False
+    )
+    assert original is not None
+    effective_at = datetime(2026, 10, 16, 12, tzinfo=UTC)
 
+    replacement = change_category(
+        db_session,
+        original.id,
+        Category.from_str("new_category"),
+        effective_at=effective_at,
+        do_commit=False,
+    )
+
+    assert original.valid_from is None
+    assert original.valid_to == effective_at
+    assert original.last_action == "changed"
+    assert replacement.name == "new_category"
+    assert replacement.valid_from == effective_at
+    assert replacement.valid_to is None
+    assert replacement.last_action == "changed"
+
+    db_session.expire(original)
+    db_session.expire(replacement)
+    assert original.valid_to == effective_at
+    assert replacement.valid_from == effective_at
+
+    # A historical name can be introduced again as a new active version.
+    reintroduced = upsert_category(
+        db_session, Category.from_str("old_category"), do_commit=False
+    )
+    assert reintroduced is not None
+    assert reintroduced.id != original.id
+    assert reintroduced.valid_from is not None
+    assert reintroduced.valid_from > original.valid_to
+    assert reintroduced.last_action == "changed"
+
+
+def test_retire_category_closes_active_version(db_session: Session):
+    category = upsert_category(
+        db_session, Category.from_str("category_to_retire"), do_commit=False
+    )
+    assert category is not None
+    effective_at = datetime(2026, 10, 16, 12, tzinfo=UTC)
+
+    retired = retire_category(
+        db_session, category.id, effective_at=effective_at, do_commit=False
+    )
+
+    assert retired.valid_to == effective_at
+    assert retired.last_action == "retired"
+    assert (
+        db_session.query(CategoryDb)
+        .filter_by(name="category_to_retire", valid_to=None)
+        .one_or_none()
+        is None
+    )
+
+
+def test_active_root_categories_are_unique(db_session: Session):
+    db_session.add_all(
+        [
+            CategoryDb(name="duplicate_root"),
+            CategoryDb(name="duplicate_root"),
+        ]
+    )
+
+    with pytest.raises(IntegrityError):
+        db_session.flush()

tests/test_ingest_b4w.py

@@ -0,0 +1,45 @@
+import re
+from datetime import date
+from decimal import Decimal
+from pathlib import Path
+
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from src.constants import IBAN_PATTERN, Currency
+from src.ingest.b4w import ingest_b4w
+from src.models.b4w import B4wDb
+
+b4w_db_column_names = [col.key for col in B4wDb.__mapper__.columns]
+
+
+# TODO: Unit tests for other funtions in src/ingest/b4w.py
+
+# TODO: Similar file for Comdirect (more work due to several tables)
+
+
+def test_ingest_b4w_e2e(db_session: Session):
+    path = Path("tests/test_data/b4w_export_dummy_01.csv")
+    ingest_b4w(path, db_session)
+    result = db_session.execute(select(B4wDb)).scalars().all()
+    assert isinstance(result, list)
+    assert all(isinstance(row.id_b4w, int) for row in result)
+    assert all(isinstance(row.date_book, date) for row in result)
+    assert all(isinstance(row.other_name, str) for row in result)
+    assert all(isinstance(row.other_iban, str) for row in result)
+    assert all(re.findall(IBAN_PATTERN, str(row.other_iban)) for row in result)
+    assert all(
+        (isinstance(row.category_id, int) or row.category_id is None) for row in result
+    )
+    assert all(isinstance(row.notes, str) for row in result)
+    assert all(isinstance(row.id, int) for row in result)
+    assert all(isinstance(row.hash_id, str) for row in result)
+    assert all(isinstance(row.account_iban, str) for row in result)
+    assert all(re.findall(IBAN_PATTERN, str(row.account_iban)) for row in result)
+    assert all(isinstance(row.account_currency, str) for row in result)
+    assert all(isinstance(row.date_valid, date) for row in result)
+    assert all(isinstance(row.amount, Decimal) for row in result)
+    assert all(isinstance(row.amount_currency, str) for row in result)
+    assert all(row.amount_currency in list(Currency) for row in result)
+    assert all(isinstance(row.text, str) for row in result)
+    print(b4w_db_column_names)

tests/test_ingest_comdirect.py

@@ -0,0 +1,35 @@
+from pathlib import Path
+
+import pytest
+from faker import Faker
+from sqlalchemy.orm import Session
+
+from src.constants import Currency
+from src.ingest.comdirect import (
+    _reader_raw_comdirect,
+    ingest_comdirect,
+    reader_comdirect,
+)
+
+TEST_DATA_PATH = Path("tests/test_data/comdirect_export_dummy_01.txt")
+
+
+def test_reader_comdirect_raw():
+    result = _reader_raw_comdirect(TEST_DATA_PATH)
+    assert result
+
+
+def test_reader_comdirect():
+    result = reader_comdirect(TEST_DATA_PATH)
+    assert result
+    assert isinstance(result, dict)
+
+
+@pytest.mark.skip
+def test_ingest_comdirect(db_session: Session):
+    ingest_comdirect(
+        session=db_session,
+        path=TEST_DATA_PATH,
+        account_iban=Faker().iban(),
+        account_currency=Currency.EUR,
+    )

tests/test_model_b4wexport.py

@@ -0,0 +1,94 @@
+import re
+
+import pytest
+from pydantic import ValidationError
+
+from src.models import B4wExport, Category
+from tests.factories import B4wExportFactory
+
+
+def test_b4w_export_simple():
+    data = B4wExportFactory.build()
+    assert isinstance(data, B4wExport)
+
+
+def test_b4w_export_category():
+    data = B4wExportFactory.build(Category="fun:stuff")
+    assert isinstance(data.category, Category)
+    assert data.category.to_str() == "fun:stuff"
+
+
+def test_b4w_export_account_iban_invalid():
+    with pytest.raises(ValidationError):
+        _ = B4wExportFactory.build(OwnrAcctIBAN="not an IBAN")
+
+
+def test_b4w_export_account_iban_to_long():
+    with pytest.raises(ValidationError):
+        _ = B4wExportFactory.build(OwnrAcctIBAN="DE990123456789012345678901234567890")
+
+
+def test_b4w_export_account_iban_to_short():
+    with pytest.raises(ValidationError):
+        _ = B4wExportFactory.build(OwnrAcctIBAN="DE123")
+
+
+def test_b4w_export_other_iban_empty_is_none():
+    data = B4wExportFactory.build(RmtdAcctIBAN="")
+    assert data.other_iban is None
+
+
+def test_b4w_export_other_iban_blank_is_none():
+    data = B4wExportFactory.build(RmtdAcctIBAN="   ")
+    assert data.other_iban is None
+
+
+def test_b4w_export_other_iban_invalid():
+    with pytest.raises(ValidationError):
+        _ = B4wExportFactory.build(RmtdAcctIBAN="not an IBAN")
+
+
+def test_b4w_export_other_iban_repr_round_trip_empty():
+    data = B4wExportFactory.build(RmtdAcctIBAN="")
+    data2 = eval(str(data))
+    assert data == data2
+
+
+def test_b4w_export_parameters_to_dict():
+    data = B4wExportFactory.build()
+    params = data.parameters_to_dict()
+    expected = sorted(field.alias for field in B4wExport.model_fields.values())
+    assert sorted(params) == expected
+    assert "OwnrAcctCcy" in params
+    assert all(isinstance(value, str) for value in params.values())
+
+
+def test_b4w_export_parameters_to_str():
+    data = B4wExportFactory.build()
+    params = data.parameters_to_str()
+    components = [s.strip() for s in re.split(r",\s*(?=\w+=)", params)]
+    param_names = [component.split("=")[0].strip() for component in components]
+    param_values = [component.split("=")[1].strip() for component in components]
+    assert "OwnrAcctCcy" in param_names
+    assert all(s.startswith("'") and s.endswith("'") for s in param_values)
+
+
+def test_b4w_export_repr_round_trip():
+    data_batch = B4wExportFactory.batch(size=10)
+    assert isinstance(data_batch, list)
+    for data in data_batch:
+        data_str = str(data)
+        data2 = eval(data_str)
+        assert data == data2
+
+
+def test_b4w_export_amount_two_decimal_places():
+    data = B4wExportFactory.build()
+    assert data.amount > 0
+    assert data.amount.as_tuple().exponent >= -2
+
+
+def test_b4w_export_text_fields_non_empty():
+    data = B4wExportFactory.build()
+    assert data.reference
+    assert data.notes

tests/test_model_category.py

@@ -1,50 +1,93 @@
-#!/bin/python
+from sqlalchemy import select
+from sqlalchemy.orm import Session
 
-from src.models import Category
+from src.models.category import Category, CategoryDb, upsert_category
 
 
-def test_single_level_category():
+def test_upsert_category_returns_orm_object(db_session: Session):
+    result = upsert_category(
+        db_session,
+        Category.from_str("dummy_parent_1:dummy_parent_2:dummy"),
+        do_commit=False,
+    )
+    assert result
+    assert isinstance(result, CategoryDb)
+    assert str(result.name) == "dummy"
+    assert str(result.parent.name) == "dummy_parent_2"
+    assert str(result.parent.parent.name) == "dummy_parent_1"
+
+
+def test_upsert_category_writes_new_to_db(db_session: Session):
+    upsert_category(
+        db_session,
+        Category.from_str("grand_father:father:new_category"),
+        do_commit=True,
+    )
+    result = db_session.execute(
+        select(CategoryDb).filter_by(name="new_category")
+    ).scalar_one()
+    assert result
+    assert str(result.name) == "new_category"
+    assert str(result.parent.name) == "father"
+    assert str(result.parent.parent.name) == "grand_father"
+
+
+def test_upsert_category_skips_existing(db_session: Session):
+    for _ in range(3):
+        upsert_category(
+            db_session,
+            Category.from_str("grand_father:father:try_again_and_again"),
+            do_commit=True,
+        )
+    result = db_session.execute(
+        select(CategoryDb).filter_by(name="try_again_and_again")
+    ).all()
+    assert len(result) == 1
+
+
+def test_category_hash_id_computed_field():
+    """Test hash_id computed field is present and deterministic."""
+    c1 = Category.from_str("single")
+    c2 = Category.from_str("single")
+    assert hasattr(c1, "hash_id")
+    assert c1.hash_id == c2.hash_id
+
+
+def test_category_hash_id_different_inputs():
+    """Test that different category hierarchies have different hash_ids."""
+    c1 = Category.from_str("A:B")
+    c2 = Category.from_str("A:C")
+    # Different last level -> different hash_id
+    assert c1.hash_id != c2.hash_id
+
+
+def test_category_to_str_single_level():
+    """Test to_str() for single-level category."""
     c = Category.from_str("single")
-    assert c
+    assert c.to_str() == "single"
-    assert c.name == "single"
-    assert c.parent is None
 
-def test_two_level_category():
-    c = Category.from_str("first:second")
-    assert c
-    assert c.name == "second"
-    assert isinstance(c.parent, Category)
-    assert c.parent.name == "first"
-    assert c.parent.parent is None
 
-def test_three_level_category():
+def test_category_to_str_nested():
-    c = Category.from_str("first:second:third")
+    """Test to_str() for nested category."""
-    assert c
+    c = Category.from_str("parent:child:grandchild")
-    assert c.name == "third"
+    assert c.to_str() == "parent:child:grandchild"
-    assert isinstance(c.parent, Category)
-    assert c.parent.name == "second"
-    assert isinstance(c.parent.parent, Category)
-    assert c.parent.parent.name == "first"
-    assert c.parent.parent.parent is None
 
-def test_single_level_category_to_string():
+
+def test_category_str_delegates_to_to_str():
+    """Test that __str__ delegates to to_str()."""
+    c = Category.from_str("A:B:C")
+    assert str(c) == c.to_str() == "A:B:C"
+
+
+def test_category_repr_simple():
+    """Test repr() for single-level category."""
     c = Category.from_str("single")
-    assert c
+    expected = 'Category.from_str("single")'
-    assert str(c) == "single"
+    assert repr(c) == expected
 
-def test_two_level_category_to_string():
-    c = Category(name = "second", parent=Category(name = "first"))
-    assert c.to_str() == "first:second"
-
-def test_three_level_category_to_string():
-    c = Category(name = "third", parent=Category(name = "second", parent=Category(name="first")))
-    assert c.to_str() == "first:second:third"
-
-def test_category_str():
-    c = Category.from_str("first:second:third")
-    assert str(c) == "first:second:third"
-
-def test_category_repr():
-    c = Category.from_str("first:second:third")
-    assert repr(c) == "Category.from_str(\"first:second:third\")"
 
+def test_category_repr_nested():
+    """Test repr() for nested category."""
+    c = Category.from_str("parent:child")
+    expected = 'Category.from_str("parent:child")'
+    assert repr(c) == expected

tests/test_model_comdirect.py

@@ -0,0 +1,24 @@
+from src.models.comdirect import ComdirectGiro
+from tests.factories import ComdirectGiroFactory
+
+
+def test_comdirect_giro_basic_and_stringification():
+    data = ComdirectGiroFactory.build()
+    assert data
+    assert isinstance(data, ComdirectGiro)
+    orig_headers = data.get_orig_headers()
+    assert orig_headers
+    assert isinstance(orig_headers, str)
+    header_list = orig_headers.split(";")
+    assert len(header_list) > 0
+    assert set(header_list) == {
+        '"Wertstellung (Valuta)"',
+        '"Umsatz in EUR"',
+        '"Buchungstag"',
+        '"Vorgang"',
+        '"Buchungstext"',
+    }
+    orig_row = data.get_orig_row()
+    assert orig_row
+    assert isinstance(orig_row, str)
+    assert len(orig_row.split(";")) > 0

tests/test_models_common.py

@@ -0,0 +1,145 @@
+"""Tests for common model utilities."""
+
+from datetime import date
+
+from src.models.common import ExportBaseModel, Sign, date2str
+
+
+class TestSignEnum:
+    """Test Sign enum from common module."""
+
+    def test_sign_str(self):
+        """Test Sign.__str__ method."""
+        assert str(Sign.DEBIT) == "DBIT"
+        assert str(Sign.CREDIT) == "CRDT"
+
+    def test_sign_repr(self):
+        """Test Sign.__repr__ method (line 24)."""
+        repr_debit = repr(Sign.DEBIT)
+        assert repr_debit == "Sign.DEBIT"
+
+        repr_credit = repr(Sign.CREDIT)
+        assert repr_credit == "Sign.CREDIT"
+
+    def test_sign_to_sign(self):
+        """Test Sign.to_sign method."""
+        assert Sign.DEBIT.to_sign() == -1
+        assert Sign.CREDIT.to_sign() == 1
+
+
+class TestDate2Str:
+    """Test date2str utility function from common module."""
+
+    def test_with_date(self):
+        """date2str with a valid date."""
+        test_date = date(2026, 10, 15)
+        result = date2str(test_date)
+        assert result == "2026-10-15"
+
+    def test_with_none_default(self):
+        """date2str with None value (line 40)."""
+        result = date2str(None)
+        assert result == "--"
+
+    def test_with_none_custom_default(self):
+        """date2str with None and custom default."""
+        result = date2str(None, default="N/A")
+        assert result == "N/A"
+
+    def test_with_date_custom_format(self):
+        """date2str with custom format."""
+        test_date = date(2026, 10, 15)
+        result = date2str(test_date, date_format="%d.%m.%Y")
+        assert result == "15.10.2026"
+
+    def test_with_none_custom_default_and_format(self):
+        """date2str with None, custom default and format."""
+        result = date2str(None, default="--", date_format="%d.%m.%Y")
+        assert result == "--"
+
+
+class TestExportBaseModel:
+    """Test ExportBaseModel methods from common module."""
+
+    def test_parameters_to_dict_empty(self):
+        """parameters_to_dict returns empty dict (line 70)."""
+
+        class TestModel(ExportBaseModel):
+            pass
+
+        model = TestModel()
+        result = model.parameters_to_dict()
+        assert result == {}
+
+    def test_parameters_to_str_no_params(self):
+        """parameters_to_str with no parameters."""
+
+        class TestModel(ExportBaseModel):
+            pass
+
+        model = TestModel()
+        result = model.parameters_to_str()
+        assert result == ""
+
+    def test_repr_empty_params(self):
+        """__repr__ with empty parameters (line 79)."""
+
+        class TestModel(ExportBaseModel):
+            pass
+
+        model = TestModel()
+
+        # __repr__ should return string representation with empty params
+        repr_result = repr(model)
+        assert "TestModel" in repr_result
+
+    def test_str_empty_params(self):
+        """__str__ with empty parameters."""
+
+        class TestModel(ExportBaseModel):
+            pass
+
+        model = TestModel()
+
+        # __str__ should return string representation
+        str_result = str(model)
+        assert "TestModel" in str_result
+
+    def test_repr_with_params(self):
+        """Test repr with actual parameters."""
+
+        class ConfigurableModel(ExportBaseModel):
+            def parameters_to_dict(self) -> dict[str, str]:
+                return {"key": "value"}
+
+        model = ConfigurableModel()
+
+        # Test that repr works correctly with params
+        repr_result = repr(model)
+        assert "key" in repr_result or "value" in repr_result
+
+    def test_str_with_params(self):
+        """Test str with actual parameters."""
+
+        class ConfigurableModel(ExportBaseModel):
+            def parameters_to_dict(self) -> dict[str, str]:
+                return {"name": "test"}
+
+        model = ConfigurableModel()
+
+        # Test that str works correctly with params
+        str_result = str(model)
+        assert "name" in str_result or "test" in str_result
+
+
+class TestMyNameMethod:
+    """Test ExportBaseModel._my_name classmethod."""
+
+    def test_my_name_returns_classname(self):
+        """_my_name should return the class name."""
+
+        class SubModel(ExportBaseModel):
+            pass
+
+        result = SubModel._my_name()
+        assert result == "SubModel"

tests/test_models_init.py

@@ -0,0 +1,110 @@
+"""Tests for src.models.__init__.py lazy loading and __dir__."""
+
+import pytest
+
+from src import models
+
+
+class TestLazyLoading:
+    """Tests for lazy attribute loading via __getattr__."""
+
+    def test_load_b4wexport(self):
+        """Test loading B4wExport model."""
+        from src.models.b4w import B4wExport as DirectB4wExport
+
+        b4w = models.B4wExport
+        assert b4w is DirectB4wExport
+
+    def test_load_category(self):
+        """Test loading Category model."""
+        from src.models.category import Category as DirectCategory
+
+        cat = models.Category
+        assert cat is DirectCategory
+
+    def test_load_categorybudgetdb(self):
+        """Test loading CategoryBudgetDb model."""
+        from src.models.category import CategoryBudgetDb as DirectCategoryBudgetDb
+
+        cbdb = models.CategoryBudgetDb
+        assert cbdb is DirectCategoryBudgetDb
+
+    def test_load_comdirectgiro(self):
+        """Test loading ComdirectGiro model."""
+        from src.models.comdirect import ComdirectGiro as DirectComdirectGiro
+
+        giro = models.ComdirectGiro
+        assert giro is DirectComdirectGiro
+
+    def test_load_transaction(self):
+        """Test loading Transaction model."""
+        from src.models.transactions import Transaction as DirectTransaction
+
+        tx = models.Transaction
+        assert tx is DirectTransaction
+
+    def test_load_account(self):
+        """Test loading Account model."""
+        from src.models.settings import Account as DirectAccount
+
+        acc = models.Account
+        assert acc is DirectAccount
+
+    def test_load_source(self):
+        """Test loading Source model."""
+        from src.models.settings import Source as DirectSource
+
+        src = models.Source
+        assert src is DirectSource
+
+    def test_nonexistent_attribute_raises(self):
+        """Test that non-existent attributes raise AttributeError."""
+        with pytest.raises(AttributeError) as exc_info:
+            # This is intentional: testing that accessing a non-existent attribute raises
+            _ = models.NonExistentModel  # type: ignore[name-defined]
+
+        expected_msg = "module 'src.models' has no attribute 'NonExistentModel'"
+        assert expected_msg in str(exc_info.value)
+
+
+class TestDirMethod:
+    """Tests for __dir__() method."""
+
+    def test_dir_returns_sorted_list(self):
+        """Test that __dir__() returns a sorted list."""
+        result = models.__dir__()
+        assert isinstance(result, list)
+        # Should be alphabetically sorted
+        assert result == sorted(result)
+
+    def test_dir_includes_all_exports(self):
+        """Test that __dir__() includes all exported models."""
+        result = models.__dir__()
+
+        expected_exports = {
+            "B4wExport",
+            "Category",
+            "CategoryBudgetDb",
+            "ComdirectCreditCard",
+            "ComdirectDepot",
+            "ComdirectGiro",
+            "Account",
+            "Source",
+            "Transaction",
+            "TransactionDb",
+        }
+
+        # All exports should be in dir()
+        for export_name in expected_exports:
+            assert export_name in result
+
+    def test_dir_includes_globals(self):
+        """Test that __dir__() includes module-level globals."""
+        result = models.__dir__()
+        assert "_EXPORTS" in result
+
+    def test_dir_is_alphabetically_sorted(self):
+        """Verify the list is truly sorted alphabetically."""
+        result = models.__dir__()
+        # Double-check: if we sort it again, it should be identical
+        assert result == sorted(result)

tests/test_reader.py

@@ -0,0 +1,26 @@
+from pathlib import Path
+
+import pytest
+
+from src.ingest.comdirect import COMDIRECT_ACCOUNT_PARSERS, reader_comdirect
+from src.models import ComdirectCreditCard, ComdirectDepot, ComdirectGiro
+
+TEST_DATA_PATH = ".local/data/comdirect/umsaetze_9773063005_20260906-2043.csv"
+
+
+@pytest.mark.skipif(
+    not Path(TEST_DATA_PATH).exists(),
+    reason=f"Testdaten fehlen: {TEST_DATA_PATH}",
+)
+def test_reader_comdirect():
+    test_path = Path(TEST_DATA_PATH)
+    data = reader_comdirect(test_path)
+    assert data
+    assert len(data) == len(COMDIRECT_ACCOUNT_PARSERS)
+    assert set(data) == set(COMDIRECT_ACCOUNT_PARSERS)
+    assert all(isinstance(row, ComdirectGiro) for row in data["Girokonto"])
+    assert all(
+        isinstance(row, ComdirectCreditCard) for row in data["Visa-Karte (Kreditkarte)"]
+    )
+    assert all(isinstance(row, ComdirectGiro) for row in data["Tagesgeld PLUS-Konto"])
+    assert all(isinstance(row, ComdirectDepot) for row in data["Depot"])

tests/test_smoke_b4w.py

@@ -0,0 +1,34 @@
+from datetime import date
+
+import faker
+from sqlalchemy.orm import Session
+
+from src.models.b4w import B4wDb
+from src.models.category import CategoryDb, upsert_category
+from tests.factories import CategoryFactory
+
+
+def _load_initial_categories(session: Session) -> None:
+    for category in CategoryFactory.build_all():
+        upsert_category(session, category, do_commit=False)
+    session.commit()
+
+
+def test_b4w_populate(populated_db_b4w):
+    val_dt_min, val_dt_max = date(2026, 1, 1), date(2026, 3, 31)
+    session = populated_db_b4w(
+        "b4w_basic",
+        100,
+        setup=_load_initial_categories,
+        ValDt=lambda: faker.Faker().date_between(val_dt_min, val_dt_max),
+    )
+    assert session
+    assert session.query(B4wDb).count() == 100
+    assert session.query(CategoryDb).count() >= len(CategoryFactory.build_all())
+    # ``ValDt`` was given as a per-row callable: it must have been resolved
+    # and persisted for every row.
+    dates = [d for (d,) in session.query(B4wDb.date_valid).all()]
+    assert all(val_dt_min <= d <= val_dt_max for d in dates)
+    # ``Id1`` is assigned per row: one distinct row per id, no dedup collisions.
+    ids = [i for (i,) in session.query(B4wDb.id_b4w).order_by(B4wDb.id_b4w).all()]
+    assert ids == list(range(1, 101))

tests/test_transactions.py

@@ -0,0 +1,196 @@
+from datetime import date
+from decimal import Decimal
+from pathlib import Path
+
+from sqlalchemy import func, select
+from sqlalchemy.orm import Session
+
+from src.ingest.b4w import ingest_b4w, upsert_b4w
+from src.ingest.comdirect import ingest_comdirect
+from src.ingest.transactions import (
+    consolidate_transactions,
+    map_b4w_to_transaction,
+    map_comdirect_giro_to_transaction,
+)
+from src.models.b4w import B4wDb
+from src.models.comdirect import ComdirectGiroDb
+from src.models.transactions import Transaction, TransactionDb
+from tests.factories import B4wExportFactory, CategoryFactory
+
+B4W_PATH = Path("tests/test_data/b4w_export_dummy_01.csv")
+COMDIRECT_PATH = Path("tests/test_data/comdirect_export_dummy_01.txt")
+
+
+def test_transaction_hash_is_business_key():
+    first = Transaction(
+        source="b4w",
+        source_row_id=1,
+        account_iban="DE89370400440532013000",
+        account_currency="EUR",
+        date_valid=date(2026, 9, 7),
+        amount=Decimal("-50.00"),
+        amount_currency="EUR",
+        date_book=date(2026, 9, 8),
+        text="Supermarket",
+        other_name="Aldi",
+    )
+    second = Transaction(
+        source="b4w",
+        source_row_id=999,
+        account_iban="DE89370400440532013000",
+        account_currency="EUR",
+        date_valid=date(2026, 9, 7),
+        amount=Decimal("-50.00"),
+        amount_currency="EUR",
+        date_book=date(2026, 9, 8),
+        text="Supermarket",
+        other_name="Aldi",
+    )
+    # Stable across source-row ids (re-imports) ...
+    assert second.hash_id == first.hash_id
+    # ... but source is part of the key, so no cross-source collision.
+    third = second.model_copy(update={"source": "comdirect_giro"})
+    assert third.hash_id != first.hash_id
+
+
+def test_map_b4w_to_transaction():
+    row = B4wDb(
+        id=7,
+        hash_id="unused",
+        id_b4w=1,
+        account_iban="DE89370400440532013000",
+        account_currency="EUR",
+        date_valid=date(2026, 9, 7),
+        date_book=date(2026, 9, 8),
+        amount=Decimal("-50.00"),
+        amount_currency="EUR",
+        text="Supermarket",
+        other_name="Aldi",
+        other_iban="DE02120300000000202051",
+        category_id=None,
+        notes="",
+    )
+    transaction = map_b4w_to_transaction(row)
+    assert isinstance(transaction, Transaction)
+    assert transaction.source == "b4w"
+    assert transaction.source_row_id == 7
+    assert transaction.amount == Decimal("-50.00")
+    assert transaction.date_book == date(2026, 9, 8)
+    assert transaction.text == "Supermarket"
+    assert transaction.other_name == "Aldi"
+    assert transaction.other_iban == "DE02120300000000202051"
+
+
+def test_map_comdirect_giro_to_transaction():
+    row = ComdirectGiroDb(
+        id=3,
+        hash_id="unused",
+        account_iban="DE89370400440532013000",
+        account_currency="EUR",
+        amount_currency="EUR",
+        date_valid=date(2026, 9, 7),
+        amount=Decimal("32.43"),
+        date_book=date(2026, 9, 8),
+        type="Kartenumsatz",
+        text="Supermarkt",
+    )
+    transaction = map_comdirect_giro_to_transaction(row)
+    assert isinstance(transaction, Transaction)
+    assert transaction.source == "comdirect_giro"
+    assert transaction.source_row_id == 3
+    assert transaction.amount == Decimal("32.43")
+    assert transaction.other_name is None
+    assert transaction.other_iban is None
+    assert transaction.category is None
+
+
+def test_consolidate_b4w_signed_amount_and_category(db_session: Session):
+    export = B4wExportFactory.build(
+        Amt="50.00",
+        RmtInf="Supermarket",
+        Category=CategoryFactory.build().to_str(),
+        CdtDbtInd="DBIT",
+    )
+    staging = upsert_b4w(db_session, export, do_commit=False)
+    assert staging is not None
+    consolidate_transactions(
+        db_session, "b4w", B4wDb, map_b4w_to_transaction, do_commit=False
+    )
+    db_session.commit()
+
+    transaction = db_session.execute(select(TransactionDb)).scalars().one()
+    assert transaction.source == "b4w"
+    assert transaction.source_row_id == staging.id
+    # b4w amount_signed: DBIT -> money out
+    assert transaction.amount == Decimal("-50.00")
+    assert transaction.category_id == staging.category_id
+    assert transaction.text == "Supermarket"
+    mapped = map_b4w_to_transaction(staging)
+    assert mapped.category is not None
+    assert mapped.category.to_str() == export.category.to_str()
+
+
+def test_ingest_b4w_e2e_idempotent(db_session: Session):
+    for _ in range(2):
+        ingest_b4w(B4W_PATH, db_session)
+
+    staging_count = db_session.execute(
+        select(func.count()).select_from(B4wDb)
+    ).scalar_one()
+    transaction_count = db_session.execute(
+        select(func.count()).select_from(TransactionDb)
+    ).scalar_one()
+    assert staging_count > 0
+    assert transaction_count == staging_count
+
+    transactions = db_session.execute(select(TransactionDb)).scalars().all()
+    assert all(t.source == "b4w" for t in transactions)
+    assert all(t.source_row_id is not None for t in transactions)
+
+
+def test_ingest_comdirect_e2e_idempotent(db_session: Session):
+    for _ in range(2):
+        ingest_comdirect(
+            session=db_session,
+            path=COMDIRECT_PATH,
+            account_iban="DE89370400440532013000",
+            account_currency="EUR",
+        )
+
+    staging_count = db_session.execute(
+        select(func.count()).select_from(ComdirectGiroDb)
+    ).scalar_one()
+    transaction_count = db_session.execute(
+        select(func.count()).select_from(TransactionDb)
+    ).scalar_one()
+    assert staging_count > 0
+    assert transaction_count == staging_count
+
+    transactions = db_session.execute(select(TransactionDb)).scalars().all()
+    assert all(t.source == "comdirect_giro" for t in transactions)
+    assert all(t.account_iban == "DE89370400440532013000" for t in transactions)
+
+
+def test_ingest_mixed_sources_into_one_table(db_session: Session):
+    ingest_b4w(B4W_PATH, db_session)
+    ingest_comdirect(
+        session=db_session,
+        path=COMDIRECT_PATH,
+        account_iban="DE89370400440532013000",
+        account_currency="EUR",
+    )
+
+    b4w_count = db_session.execute(select(func.count()).select_from(B4wDb)).scalar_one()
+    giro_count = db_session.execute(
+        select(func.count()).select_from(ComdirectGiroDb)
+    ).scalar_one()
+    transaction_count = db_session.execute(
+        select(func.count()).select_from(TransactionDb)
+    ).scalar_one()
+
+    assert b4w_count > 0
+    assert giro_count > 0
+    assert transaction_count == b4w_count + giro_count
+
+    sources = set(db_session.execute(select(TransactionDb.source).distinct()).scalars())
+    assert sources == {"b4w", "comdirect_giro"}

uv.lock

@@ -1,19 +1,23 @@
 version = 1
-revision = 3
+revision = 5
 requires-python = ">=3.14"
+resolution-markers = [
+    "python_full_version >= '3.15'",
+    "python_full_version < '3.15'",
+]
 
 [[package]]
 name = "alembic"
-version = "1.19.1"
+version = "1.19.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "mako" },
     { name = "sqlalchemy" },
     { name = "typing-extensions" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/16/2b/e4153978368de59918115c9e01d3ebf58a558a7285efa7e960c383c4b59a/alembic-1.19.1.tar.gz", hash = "sha256:e0fca0518118c78acc493e31bcb5402f190057aaf6df8b5b95ce94c4789cf648", size = 2070816, upload-time = "2026-08-08T16:32:01.565Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/34/10/181eecdd552217d0342492bd6f3b8a96e973083379aace3d3402830ddc03/alembic-1.19.2.tar.gz", hash = "sha256:297950a8a91f6770eb82bfbce9bea55c728b90a5386c6e81430191a319d138b0", size = 2082643, upload-time = "2026-09-04T17:10:11.212Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/20/89/e62cc37b69ad357cc8ecd6e7367f5245f523d3cbb338a66197212bdf6749/alembic-1.19.1-py3-none-any.whl", hash = "sha256:b39018cb3d9413a19cbd54cf3c02ad33998641f0538eb77413a488a21c3e14be", size = 265946, upload-time = "2026-08-08T16:32:03.153Z" },
+    { url = "https://files.pythonhosted.org/packages/9c/cb/9014784dcb0585977ae23b6f43331d0a33c51ac0d692506d12b4f5ee9f3b/alembic-1.19.2-py3-none-any.whl", hash = "sha256:32d553dcd577e6fe5c3c63e91468526d35e4dcecafe865d7db4e9b328fa93cb2", size = 267399, upload-time = "2026-09-04T17:10:12.796Z" },
 ]
 
 [[package]]
@@ -34,6 +38,101 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/f2/94/3af39d34be01a24a6e65433d19e107099374224905f1e0cc6bbe1fd22a2f/argparse-1.4.0-py2.py3-none-any.whl", hash = "sha256:c31647edb69fd3d465a847ea3157d37bed1f95f19760b11a47aa91c04b666314", size = 23000, upload-time = "2015-09-14T16:03:16.137Z" },
 ]
 
+[[package]]
+name = "ast-serialize"
+version = "0.12.1"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/c2/1c/7257e6ec9382843915ce475558ce4492ccb5ed39122c256bb369c27e2ebf/ast_serialize-0.12.1.tar.gz", hash = "sha256:5285a390caf1c44368ae270f037f797b91427d138b7d43cad0f1fda4c83518d9", size = 954408, upload-time = "2026-10-03T12:25:00.221Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/4a/f7/e976169da322c009bb083a52d21e88fbfe5f071e1806e8c8361ab4ac477a/ast_serialize-0.12.1-cp314-cp314-pyemscripten_2026_0_wasm32.whl", hash = "sha256:e73255c9227fd74eac8a9b55c4049e8ad7b66d1f690bf827c98a86b2e594def7", size = 897232, upload-time = "2026-10-03T12:23:21.945Z" },
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 name = "dotenv"
 version = "0.9.9"
@@ -74,15 +255,21 @@ dependencies = [
     { name = "alembic" },
     { name = "argparse" },
     { name = "dotenv" },
+    { name = "mypy" },
     { name = "pydantic" },
     { name = "pytest" },
+    { name = "pytest-cov" },
     { name = "python-dotenv" },
     { name = "sqlalchemy" },
 ]
 
 [package.dev-dependencies]
 dev = [
+    { name = "black" },
+    { name = "debugpy" },
+    { name = "faker" },
     { name = "polyfactory" },
+    { name = "ruff" },
 ]
 
 [package.metadata]
@@ -90,14 +277,22 @@ requires-dist = [
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     { name = "argparse", specifier = ">=1.4.0" },
     { name = "dotenv", specifier = ">=0.9.9" },
+    { name = "mypy", specifier = ">=2.4.0" },
     { name = "pydantic", specifier = ">=2.13.5" },
     { name = "pytest", specifier = ">=9.1.1" },
+    { name = "pytest-cov", specifier = ">=7.1.0" },
     { name = "python-dotenv", specifier = ">=1.2.3" },
     { name = "sqlalchemy", specifier = ">=2.0.52" },
 ]
 
 [package.metadata.requires-dev]
-dev = [{ name = "polyfactory", specifier = ">=3.3.0" }]
+dev = [
+    { name = "black", specifier = ">=26.5.1" },
+    { name = "debugpy", specifier = ">=1.8.21" },
+    { name = "faker", specifier = ">=40.38.0" },
+    { name = "polyfactory", specifier = ">=3.3.0" },
+    { name = "ruff", specifier = ">=0.16.7" },
+]
 
 [[package]]
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 ]
 
+[[package]]
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