thermograph/backend/alembic/script.py.mako

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Containerize the app and move the databases to PostgreSQL 18 (#220) 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.
2026-07-20 06:28:23 +00:00
"""${message}
Revision ID: ${up_revision}
Revises: ${down_revision | comma,n}
Create Date: ${create_date}
"""
from alembic import op
import sqlalchemy as sa
${imports if imports else ""}
revision = ${repr(up_revision)}
down_revision = ${repr(down_revision)}
branch_labels = ${repr(branch_labels)}
depends_on = ${repr(depends_on)}
def upgrade() -> None:
${upgrades if upgrades else "pass"}
def downgrade() -> None:
${downgrades if downgrades else "pass"}