* fix(chats): handle null bytes in PostgreSQL search
Removes null bytes from message content before performing
case-insensitive search in PostgreSQL, preventing conversion
errors and ensuring reliable query results.
* fix(chats): prevent null byte errors in PostgreSQL queries
Ensures chat content and titles containing null bytes are excluded from PostgreSQL text queries to avoid conversion errors.
Improves reliability of search and filtering by handling problematic characters in JSON fields.
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