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fix(sqlite): add safe fallback and migrate debug prints to logging

chore(debug): add runtime logs to inspect DEFAULT_SQLITE_PATH resolution

chore(debug): add runtime logs to inspect DEFAULT_SQLITE_PATH resolution

fix(pipeline): enforce demo SQLite fallback when no db_id is provided

fix(pipeline): enforce demo SQLite fallback when no db_id is provided

chore: track data/demo.db and update gitignore

feat(api): expose executor result in NL2SQLResponse and return full result to UI

feat(metrics): enable repair tracking and Prometheus lifecycle for observability

fix: resolve SQLite path mismatch and ambiguity false positives

fix(adapter): add fallback lookup for uploaded DBs in /tmp/nl2sql_dbs

fix(sqlite): unify adapter path resolution and load from env for stable pipeline execution

feat(metrics): instrument in-memory NL→SQL cache with hit/miss counters

feat(api): add /health endpoint

feat(auth): guard core endpoints with X-API-Key (dev-friendly)

feat(cache): add lightweight in-memory TTL cache for NL→SQL responses

feat(pipeline): auto-derive schema_preview when db_id is provided

feat(api): add /schema endpoint for database introspection

fix(router): align _select_adapter with upload_db via shared DB_MAP + TTL cleanup

feat(metrics): integrate Prometheus; expose /metrics; instrument safety & verifier

feat(trace): standardize StageTrace (add summary) and coerce duration_ms to int at API boundary

test-mode: stub runner in router; factory stubs accept positional calls

fix(router): lazy pipeline build for pytest; fix(factory): stubs accept positional/keyword args

refactor(core): DI-ready Pipeline; add registry + YAML factory + typed trace/result

refactor(core): DI-ready Pipeline; add registry + YAML factory + typed trace/result

fix(router): coerce trace.duration_ms to int in response (_round_trace)

refactor(router): inject pipeline via Depends(get_runner); preserve error dump logging

test(router): use _RUN hook to fake pipeline.run in router tests

test(router): monkeypatch _pipeline.run instead of nl2sql.Pipeline.run

fix(router): re-export Pipeline via alias to satisfy test monkeypatch; remove duplicate import

fix(router): avoid Pipeline redefinition; expose Pipeline via import for test monkeypatch

fix(types): avoid mypy no-redef in nl2sql_handler by predeclaring pipeline_obj

fix(api): map FinalResult → HTTP (200/400) and stabilize nl2sql handler; prevent 500s in tests

fix(api): map FinalResult → HTTP (200/400) and stabilize nl2sql handler; prevent 500s in tests

fix(typing): split adapter vars in /readyz to satisfy mypy

fix(api): make adapter non-optional within branch and annotate pipeline for mypy

fix(router): make final_preview assignment mypy-safe (ensure always str)

fix(router): make _db type-safe and clean up nl2sql_handler preview logic

tests green: fix pipeline reference in router and adjust verifier logic for aggregation & error handling

fix(mypy): add types-requests, validate numeric inputs, enforce non-null schema_preview

fix(pipeline): align backend-frontend schema and stabilize SQL flow

style: format code with ruff

feat(demo): add initial Gradio UI with optional SQLite upload

tests: fix import-time KeyError by ensuring OPENAI_ in conftest and lazy-import router in test_ambiguity