update ci/cd config

timescaledb2/initdb/01-create-extensions.sql

@@ -0,0 +1,19 @@
+-- Triggered on first start only (when $PGDATA is empty).
+-- Enables TimescaleDB extension in the datahub database.
+--
+-- Three-layer defense for extension activation:
+--   1. Upstream timescale image: /docker-entrypoint-initdb.d/000_install_timescaledb.sh
+--      already runs CREATE EXTENSION in $POSTGRES_DB; this file is defensive backup.
+--   2. This script: explicit \connect datahub then CREATE EXTENSION.
+--   3. backend/migrations/2026_05_07_100000_enable_timescaledb_extension.php
+--      runs CREATE EXTENSION IF NOT EXISTS on application boot.
+--
+-- All three layers are idempotent (IF NOT EXISTS), zero runtime cost.
+
+\connect datahub
+
+CREATE EXTENSION IF NOT EXISTS timescaledb;
+
+-- Future extensions can be added here, e.g.:
+-- CREATE EXTENSION IF NOT EXISTS pg_stat_statements;
+-- CREATE EXTENSION IF NOT EXISTS pg_trgm;