When a failure mirroring want to insert a record to database.

[lunny]

irror/mirror_pull.go:293:runSync() [E] CreateRepositoryNotice: Error 1406 (22001): Data too long for column 'description' at row 1

[yp05327]

Error log is too long? Should we always save stderrMessage in DB?

[lunny]

description is 16K, it's enough for most situations.