fix: preserve typed growth report revisions

migrations/000002_growth_analyst.sql

@@ -14,7 +14,7 @@ CREATE TABLE IF NOT EXISTS growth_reports (
     prompt_version text NOT NULL,
     schema_version text NOT NULL,
     model text NOT NULL,
-    deterministic_evidence jsonb NOT NULL DEFAULT '{}'::jsonb,
+    deterministic_evidence jsonb,
     ai_response jsonb,
     failure_code text,
     input_tokens bigint NOT NULL DEFAULT 0 CHECK (input_tokens >= 0),
@@ -36,7 +36,7 @@ CREATE UNIQUE INDEX IF NOT EXISTS growth_reports_daily_merchant_refresh_idx
     WHERE manual_refresh = true;
 -- statement-break
 CREATE INDEX IF NOT EXISTS growth_reports_scope_latest_idx
-    ON growth_reports (merchant_id, terminal_id, created_at DESC);
+    ON growth_reports (merchant_id, terminal_id, revision DESC, created_at DESC);
 -- statement-break
 CREATE INDEX IF NOT EXISTS growth_reports_pending_idx
     ON growth_reports (created_at)