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Found by test-deploying on a Windows + MySQL 8.0 VM: migration 7a01 seeds the canonical relationship types with a raw INSERT that omits the NOT-NULL createddate/modifieddate columns (the ORM supplies those via Python defaults at runtime, but a raw migration INSERT does not). MySQL 5.x's lax default sql_mode accepted it; strict MySQL 8 rejects it with 1364 "Field 'createddate' doesn't have a default value", so a fresh `flask db upgrade` died at 7a01. Dev runs MySQL 5.6, so this never surfaced locally. migrations/env.py now sets the migration session sql_mode to NO_ENGINE_SUBSTITUTION (dropping STRICT_TRANS_TABLES) for the migration run only - the app's own runtime connections keep their mode. Makes the whole chain portable across MySQL versions. Guarded for non-MySQL (sqlite tests). 68 migration/smoke tests pass; fresh upgrade to head verified on MySQL. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Single-database configuration for Flask.