Postgres logs show an error when executing count function on character data.

ERROR: operator does not exist: character varying >= integer at character 55
HINT: No operator matches the given name and argument type(s). You might need to add explicit type casts.
STATEMENT: SELECT COUNT('x') FROM mdl_local_reminders WHERE time >= 1611850862

This comes from clean_local_reminders_logs function  around line 520
$recordcount = $DB->count_records_select(REMINDERS_CLEAN_TABLE, "time >= $cutofftime");