The previous SAVEPOINT approach failed because Go's tx.Exec() stops at
the first error and never reaches the ROLLBACK TO statements. This caused
every subsequent startup to re-run migration 0002, fail on the first
ALTER (column already exists from a prior partial run), and crash.
Fix runMigration() to:
- Execute migrations without a wrapping transaction (DDL in SQLite is
auto-commit anyway)
- Treat "duplicate column name" / "already exists" errors as success
and record the migration anyway, covering cases where a previous
failed attempt already partially modified the schema
Also simplify 0002_nfs_structured.sql back to plain ALTER TABLE
statements (no SAVEPOINT needed with the new Go-level tolerance).
Bump VERSION 0.1.9 -> 0.1.10