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I Luk Kim d82ba624e2 chore: remove SQLite entirely, PostgreSQL only
SQLite was never used in production (Docker Compose always sets
DATABASE_URL to postgresql+asyncpg://...) but the fallback kept
creating confusing stock_oracle.db files locally.

- config.py: default DATABASE_URL fallback → PostgreSQL (localhost:15433)
- database.py: remove _is_sqlite conditional branch and NullPool import
- error_logs.py: replace strftime/dialect-check with pg to_char()
- request_logs.py: replace strftime with pg to_char()
- feature_builder.py: remove _ensure_utc() helper and all call sites
- overlay_pipeline.py: remove naive-datetime workaround for is_stale()
- requirements-api.txt / requirements-test.txt: drop aiosqlite
- stock_oracle.db: deleted

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
5 months ago
..
v1 chore: remove SQLite entirely, PostgreSQL only 5 months ago
__init__.py Initial commit with full project improvements 5 months ago