The reconciler's IX_JobApplications_OwnerUserId_FollowUpAt was declared as
(OwnerUserId(191), FollowUpAt) with no prefix length on FollowUpAt. But
FollowUpAt is `text` on MariaDB -- JobApplications is migration-owned and
the migration was scaffolded against SQLite, which stores DateTimeOffset
as TEXT. A text column cannot be indexed without a prefix length, so this
index failed the 3072-byte key check on EVERY MariaDB boot, was caught by
TryCreateIndex, and was silently skipped -- leaving the follow-up reminder
query (OwnerUserId + FollowUpAt) unindexed.
Two consequences, both real:
- the index the code intends to create never existed on MariaDB
- every healthy boot logged "Specified key was too long", which
deploy/first-production-deployment.md lists as a STOP-AND-ROLL-BACK
signal -- so an operator following the runbook could abort a good deploy
The author already handled the identical problem for the longtext Status
column one line below with Status(50). Apply the same fix: FollowUpAt(20).
ISO-8601 date strings sort lexicographically, so a 20-char prefix
("YYYY-MM-DD HH:MM:SS") keeps the index useful for the reminder scan.
Verified on a fresh empty MariaDB 11 container: the index is now created
(both key parts present), zero "Specified key was too long" lines, zero
skipped indexes, zero unhandled exceptions, 42 tables, app healthy. This
was the only unprefixed text column in any reconciler composite index --
the datetime columns on reconciler-owned tables are datetime(6). SQLite is
unaffected (its CREATE INDEX has no key-length limit).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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