Root cause: CREATE TABLE IF NOT EXISTS is a no-op on existing tables,
so stale schemas miss new columns. Views (07+) then fail with
UNKNOWN_IDENTIFIER errors.
Fix: split SQL execution into 3 phases:
Phase 1: databases, raw tables, dictionaries (00-04)
Phase 2: DROP all derived tables (agg_*, ml_*) — safe, repopulated by MVs
Phase 3: recreate derived tables + views with full current schema (05-12)
This removes the incomplete inline migrations and makes the script
truly idempotent regardless of prior schema version.
Tested: fresh --reset, existing stale DB, idempotent re-run.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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