Simplified insight grabbers

tests/README.md

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+# Tests
+
+This directory contains tests for the meta_api_grabber project.
+
+## Running Tests
+
+Install test dependencies:
+```bash
+uv sync --extra test
+```
+
+Run all tests:
+```bash
+uv run pytest
+```
+
+Run specific test file:
+```bash
+uv run pytest tests/test_field_schema_validation.py -v
+```
+
+Run with coverage:
+```bash
+uv run pytest --cov=meta_api_grabber
+```
+
+## Test Files
+
+### `test_field_schema_validation.py`
+Validates that all fields requested by the grab_* methods in `scheduled_grabber.py` exist in the database schema. This ensures:
+- Field compatibility between Meta API and database
+- Early detection of schema mismatches
+- Consistency across all insight levels (account, campaign, adset, country)
+
+**Why this test is important:** When new fields are added to the Meta API field lists, this test quickly alerts you if the corresponding database columns need to be added.
+
+## Writing Tests
+
+Use markers to categorize tests:
+```python
+@pytest.mark.unit
+def test_something():
+    pass
+
+@pytest.mark.integration
+async def test_database_connection():
+    pass
+```
+
+Run only unit tests:
+```bash
+uv run pytest -m unit
+```
+
+Run everything except integration tests:
+```bash
+uv run pytest -m "not integration"
+```