feat(sql-editor): schema history sample for table v1…vN

[huyplb]

Why

A bookmark you can run tomorrow to exercise History: table growth v1…vN, column mutations, and Revert.

Sample

SQL Editor → Bookmarks → Add samples (or Refresh samples) → ★ Sample · Schema history (table v1…vN)

Works on SQLite, Postgres, or MySQL. Safe mode OFF.

How to test

1. Add a SQLite file credential (or use Postgres). Check it as a destination.
2. Open the sample. Play the JS playbook cell first — it lists the steps.
3. Play CREATE TABLE only (strip ▶), then Compare Schema → Snapshot target.
4. Play ADD email and CREATE INDEX, Snapshot again.
5. Play ADD phone and CREATE VIEW, Snapshot again.
6. History → confirm Tables / Views / Functions / Procedures + Changes only.
7. Click fox_hist_customers:
   • Columns at the selected version
   • Growth v1…v3 (2 cols → 3 cols, then an index + view in the graph)
   • Change timeline: email ADD, phone ADD
   • Click v1 to see the initial columns; Revert on v1 plans dropping email/phone (lossy — confirm before apply)

Cleanup cells (DROP VIEW / DROP TABLE) reset the demo so you can start over.

Tests

sqlEditorSamples.test.ts — unique id, splits into a playbook JS cell plus per-version SQL, last=null still ok.