Replace the per-cell parquet cache with TimescaleDB hypertables as the
production backend for the raw daily climate record, and drop pg_duckdb.
Parquet stays the backend whenever THERMOGRAPH_DATABASE_URL is not a
Postgres URL (dev, tests, offline tooling), the same dialect switch the
accounts DB and derived store already use, so CI stays Postgres-free.
- data/climate_store.py: psycopg + polars bridge over climate_history
(a hypertable), climate_recent, and climate_sync (per-cell freshness).
Reads via pl.read_database, writes via COPY + ON CONFLICT upsert;
fail-soft to a cache miss so a DB hiccup degrades to upstream refetch.
- data/climate.py: route every cache/mtime touchpoint through a backend
dispatch. recent_stamp becomes int(recent_synced_at) on Postgres; the
stale-serve path still avoids bumping it, so derived-payload tokens
invalidate on exactly the same events as before.
- alembic 0002: CREATE EXTENSION timescaledb plus the hypertable schema
(compression policy on year-old chunks), guarded to no-op off Postgres.
- migrate_cache_to_pg.py (make migrate-cache): idempotent backfill of the
parquet cache into the hypertables, preserving file mtimes as sync
timestamps so recent_stamp is unchanged across cutover.
- db image -> stock timescale/timescaledb:latest-pg18; drop the custom
pg_duckdb Dockerfile, the read-only /parquet mount, and the duckdb
tuning GUC. Docs updated for the new backend and cutover.
Co-authored-by: Claude <noreply@anthropic.com>
Two prod-readiness hardening changes:
DB tuning scales with the container budget. Replace the fixed 8 GB
20-tuning.sql with 20-tuning.sh, which derives shared_buffers (25%),
effective_cache_size (75%), work_mem, maintenance_work_mem and
duckdb.max_memory (50%) from the DB_MEMORY the compose db service now passes in.
The ratios reproduce the historical 8 GB tuning exactly and scale linearly, so
the 48 GB prod box (db_memory 16g) gets shared_buffers 4 GB / duckdb 8 GB with
no separate edit. Beta/local (8g default) are unchanged. Docs that told
operators to raise the tuning by hand are updated.
Boot ordering for the self-hosted archive. On an openmeteo host, install a
docker.service drop-in (Wants/After rclone-om.service) so Docker starts after
the object-storage mount is ready on every boot — the restart-policy containers
never bind an empty mount point. rclone-om is Type=notify, so After waits for
the mount to actually be ready. Cleaned up when openmeteo is toggled off.
