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[fix] DB connection resilience: pool_pre_ping so idle connections don't stall the ETL #14

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[fix] DB connection resilience: pool_pre_ping so idle connections don't stall the ETL #14

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7 changes: 6 additions & 1 deletion backend/src/db/main.py
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Expand Up @@ -3,7 +3,12 @@

from src.constants import CONN_STR

engine = create_engine(CONN_STR)
# pool_pre_ping: a pooled connection idle across the hourly-cron gap goes stale
# (Cloud SQL / db-f1-micro / the Cloud SQL proxy reap idle connections), and the
# next query raises "server closed the connection unexpectedly", 500ing the ETL
# trigger and stalling ingestion. pre_ping reconnects transparently; recycle
# drops connections older than 30 min proactively.
engine = create_engine(CONN_STR, pool_pre_ping=True, pool_recycle=1800)

Session = sessionmaker(bind=engine)

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