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feat: extraction framework overhaul — extract_core shared package + SQLite state tracking

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- Add extract/extract_core/ workspace package with three modules:
  - state.py: SQLite run tracking (open_state_db, start_run, end_run, get_last_cursor)
  - http.py: niquests session factory + etag normalization helpers
  - files.py: landing_path, content_hash, write_bytes_atomic (atomic gzip writes)
- State lives at {LANDING_DIR}/.state.sqlite — no extra env var needed
- SQLite chosen over DuckDB: state tracking is OLTP (row inserts/updates), not analytical
- Refactor all 4 extractors (psdonline, cftc_cot, coffee_prices, ice_stocks):
  - Replace inline boilerplate with extract_core helpers
  - Add start_run/end_run tracking to every extraction entry point
  - extract_cot_year returns int (bytes_written) instead of bool
- Update tests: assert result == 0 (not `is False`) for the return type change

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Deeman
2026-02-22 14:37:50 +01:00
parent fc4121183c
commit 80c1163a7f
16 changed files with 702 additions and 290 deletions
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extract/coffee_prices/pyproject.toml
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@@ -4,6 +4,7 @@ version = "0.1.0"
description = "KC=F Coffee C futures price extractor"
requires-python = ">=3.13"
dependencies = [
"extract_core",
"yfinance>=0.2.55",
]