Development Checklist

Phase 0: Design Finalization

• [x] Finalize package name
• [x] Finalize public API names
• [x] Finalize semantics documentation
• [x] Finalize 3 target DBs for MVP

Phase 1: Core Implementation

• [x] RowChange
• [x] PollContext
• [x] Error hierarchy
• [x] Retry helper
• [x] PollRunner

Phase 2: State Storage

• [x] BlobCheckpointStore
• [x] Lease/fencing implementation
• [x] Checkpoint serializer
• [x] Source fingerprint

Phase 3: Adapters

• [x] SQLAlchemy base adapter
• [x] Postgres adapter
• [x] MySQL adapter
• [x] SQL Server adapter
• [x] Contract tests

Phase 4: Functions Integration

• [x] Imperative runner
• [x] Decorator sugar
• [x] Sample function_app.py
• [x] Local runtime smoke test

Phase 5: Observability

• [x] Structured logs
• [x] Metrics hooks
• [x] Lag calculation
• [x] Dashboard examples

Phase 6: Release

• [x] README quickstart
• [x] PyPI metadata
• [x] Versioning
• [x] Changelog
• [x] Release checklist

Phase 7: Hardening

• [x] Chaos tests
• [x] Crash recovery tests
• [x] Duplicate window documentation
• [x] Benchmark

Phase 8: Shared Core

• [x] DbConfig
• [x] EngineProvider (lazy singleton, pool management)
• [x] Shared types (Row, RowDict)
• [x] Shared error hierarchy refactor
• [x] Shared serializers extraction

Phase 9: Binding - Input

• [x] DbReader
• [x] get() (single row by PK)
• [x] query() (raw SQL)
• [x] Connection lifecycle
• [x] Unit tests
• [x] Integration tests (SQLite)

Phase 10: Binding - Output

• [x] DbWriter
• [x] insert / upsert / update / delete
• [x] insert_many / upsert_many (batch)
• [x] Transaction management
• [x] Unit tests
• [x] Integration tests (SQLite)

Phase 11: Binding Integration

• [x] Trigger + output binding combined example
• [x] Binding decorator sugar (DbBindings: trigger, input, output)
• [x] Docs update
• [x] Sample function_app.py with binding