Terraform config under terraform/ manages the two existing VPS hosts and hands the
app to docker-compose, with local state:
- prod: the new 48GB/12-core VPS (release branch, thermograph.org), sized larger.
- beta: the old VPS 75.119.132.91 (main branch, testing tier), no public domain.
- The LAN dev box stays on deploy/deploy-dev.sh (dev branch) — out of Terraform.
A reusable module (modules/thermograph-host) SSHes each host to install docker/
compose/ufw (+ Caddy when a domain is set), sync the checkout to the host's branch,
render /etc/thermograph.env from Terraform variables (secrets pushed via provisioner
content, never on local disk), `docker compose up -d`, and health-check. Named
volumes are preserved on re-apply, so the Postgres data is never recreated.
Container resources are now env-driven in docker-compose.yml (APP_CPUS/DB_CPUS/
DB_MEMORY/WORKERS) with unchanged defaults, so Terraform can size each host.
deploy/db/init/20-tuning.sql sets the memory budget via ALTER SYSTEM (applied on a
fresh volume, effective after the post-init restart): shared_buffers 2GB,
effective_cache_size 6GB, work_mem 64MB, maintenance_work_mem 512MB, max_wal_size
4GB, plus duckdb.max_memory 4GB for parquet processing.
Compose: the db container gets an 8g memory ceiling + 1g shm_size (parallel-query
shared memory) in prod; the dev overlay resets mem_limit so dev memory is uncapped
too (the ~8 GB budget still comes from the tuning). Verified the settings take
effect and pg_duckdb still loads.
Run Thermograph as a docker-compose stack (app + Postgres 18) and standardize the
data layer on Postgres, while keeping the test suite on SQLite.
- accounts/db.py: DSN-driven engines. On Postgres, a per-worker read-write +
read-only asyncpg pair (the RO engine pins read-only transactions, used by the
pure-GET endpoints) plus a sync psycopg engine for the notifier thread; the
SQLite path is preserved for tests/local (selected when THERMOGRAPH_DATABASE_URL
is unset). models.py: boolean server_default -> sa.false().
- store.py / metrics.py: dialect-flexible — Postgres UNLOGGED tables via psycopg
when configured, else the existing raw-sqlite3 paths byte-for-byte; sync
interfaces and every fail-soft contract preserved.
- Alembic (backend/alembic/) manages the accounts schema; the container entrypoint
runs `alembic upgrade head` before uvicorn (4 workers). migrate_accounts_to_pg.py
copies the accounts data SQLite->PG through the ORM (UUID/bool/JSON coerced),
skips access_token, and resets identity sequences.
- Dockerfile + docker-compose.yml: app image (uvicorn, 4 workers, loopback 8137)
and a Postgres 18 db (2 CPUs) running pg_duckdb (deploy/db/) so the parquet
climate cache is queryable in-DB via read_parquet('/parquet/cache/*.parquet').
- deploy.sh/thermograph.service rewired to manage the compose stack; env example,
Makefile targets (up/down/db-up), and deploy/POSTGRES-MIGRATION.md cutover runbook.
Tests stay on SQLite (dialect fallback) — 323 pass. The full Postgres stack was
verified via docker compose: alembic migrations, register/login, the RO endpoint,
store/metrics round-trips, and the accounts data migration.
