The forward-compat CREATE TABLE IF NOT EXISTS papered over a stale-DB
problem we don't need to support — the canonical INBOUND_SCHEMA in
src/db/schema.ts already creates session_routing for every fresh
session DB. Pre-existing local DBs that predate the schema entry are
treated as garbage and recreated, not migrated.
Schema is the single source of truth; write paths shouldn't carry
defensive table-creation logic.
53e12a627f