Three product implications stand out:

1. Keep table navigation stable. Do not let long values resize rows.
2. Add an inspect action for the selected cell. Treat it as read-only by default.
3. Reuse existing structured JSON affordances instead of inventing a separate viewer.

The most concrete UI gap is not SQLite-specific. SQLite makes it visible because local AI tools commonly store prompts, transcripts, tool outputs, and memory summaries in TEXT columns, but PostgreSQL users with JSONB and TEXT columns will benefit from the same design.