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fix(db): avoid redundant schema migrations on restart · 9a867442Upgrade the SQLite GORM driver to correctly distinguish unique indexes from constraints. Normalize equivalent MySQL decimal defaults and PostgreSQL CHAR metadata during migration comparison while preserving real schema changes. Validation: 27 fresh-start and rc.26 upgrade scenarios using SQLite 3.50.4, MySQL 5.7.44, PostgreSQL 9.6.24, and ClickHouse 25.8.33.6; 15 upgraded databases passed uniqueness checks. Relational databases issue no DDL on unchanged restarts. Existing ClickHouse TTL synchronization remains unchanged.
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