KITFORMA · EDITORIAL ANSWER
Why does sqlite3 reject a connection created in another thread?
KitForma editorial guide. Python’s sqlite3 connection checks thread ownership by default. Sharing one connection casually can mix transaction state between callers.
Step-by-step answer
Python’s sqlite3 connection checks thread ownership by default. Sharing one connection casually can mix transaction state between callers.
Prefer a connection owned by each worker or a single database worker receiving serialized requests. Disabling
check_same_thread removes the guard but does not design safe write coordination. Test concurrent transactions and rollback paths, not merely two successful SELECT calls. SQLite library threading mode and application transaction ownership both matter. Keep connection creation and cleanup tied to worker lifetime, and avoid carrying a connection across a fork or serializing it into a process pool.Sources and verification
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