Three CHECK constraints shipped with PostgreSQL identifier quoting left over
from the MySQL port:
ck_grn_config_singleton CHECK ("ConfigId" = 1)
ck_sales_config_singleton CHECK ("ConfigId" = 1)
ck_warranty_periods_months CHECK ("Months" BETWEEN 1 AND 600)
ANSI_QUOTES is not in MariaDB's default sql_mode, so a double-quoted token is a
*string literal*, not an identifier. `"ConfigId" = 1` therefore evaluates as
`'ConfigId' = 1`; MariaDB coerces the string to a number to compare it and,
under strict mode, raises `Truncated incorrect DECIMAL value: 'ConfigId'`.
The DDL creates fine and only breaks at runtime, so this got through the
deploy and then failed every INSERT into grn_config, sales_config and
warranty_periods. That includes DataSeeder's two singleton config rows, which
run immediately after MigrateAsync() in Program.cs — so the service threw
"Database migration succeeded, but startup seeding failed" on every boot and
systemd restart-looped (counter reached 110, each restart dumping core).
Fixed in the entity configurations and repaired on existing databases by
migration 20261005190000_FixCheckConstraintQuotingForMySql, which drops and
re-adds the three constraints with backticks. The drop/add is emitted as raw
SQL rather than DropCheckConstraint because MariaDB spells the removal
DROP CONSTRAINT, not MySQL's DROP CHECK; IF EXISTS keeps it re-runnable on a
database where the broken constraint was already removed by hand.
The identical trap was swept during the port itself; these three were
reintroduced by a feature migration written afterwards.
No data cleanup is needed: the failing inserts never committed, so the
affected tables are empty.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
ImanThiyanga