quantmodel — Create sqlite data-sources DB for historic prices/macros; reads must not dirty the DB file

Objective

Create sqlite data-sources DB for historic prices/macros; reads must not dirty the DB file.

Notes: Sqlite data/market.sqlite + CLI; RO mode=ro/query_only; wired download_ticker + download_fred_series; tests/test_datastore.py 8 passed. Findings: sqlite-datastore-t99.md

Approach

Reuses existing report research/findings/sqlite-datastore-t99.md — tables/metrics preserved verbatim via source_report pointer. Body below summarizes grounded evidence from that report and adjacent artifacts.

Files / code / data changed

Associated commits (inferred from log grep t99):

75588d81 research: t99 sqlite market/macro datastore (RO reads) (#109)
75588d81 research: t99 sqlite market/macro datastore (RO reads) (#109)
Source report: research/findings/sqlite-datastore-t99.md
Task-history entry: research/findings/task-history.json#t99

Results

Key table from source report (preserved):

Piece	Path
Module + CLI	`backtest/datastore.py` (`python3 -m backtest.datastore`)
Price wire-through	`backtest/data.py` → `download_ticker` / `download_history`
Macro wire-through	`backtest/macro.py` → `download_fred_series`
Tests	`tests/test_datastore.py` (8 cases; RO dirty-check)

Conclusions and metrics are in research/findings/sqlite-datastore-t99.md; see detail page for preserved tables/metrics.

Conclusions

[reconstructed — uncertain] Outcome inferred from status done and task note.

Problems / follow-ups

See source report or PR discussion for follow-ups. No unsupported follow-ups fabricated.