Use when handling database errors in Frappe/ERPNext. Covers DuplicateEntryError, LinkValidationError, MandatoryError, TimestampMismatchError, CharacterLengthExceededError, InReadOnlyMode, QueryTimeoutError, SQL injection errors, frappe.db.sql parameter format (% vs %s), get_value returning None, transaction deadlocks, MariaDB gone away, too many connections. Error-to-fix mapping for v14/v15/v16. Keywords: database error, DuplicateEntryError, TimestampMismatchError,, MariaDB error, MySQL error, column not found, table missing, duplicate entry, database crash. SQL injection, deadlock, MariaDB gone away, query timeout.
