Apply wahoo-route-update: PUT on re-push instead of duplicate POST

Re-pushing an edited route to Wahoo now updates the existing remote
route via PUT against the stored remote_id instead of POSTing a new
copy. external_id drops the version suffix and identifies the logical
route. sync_pushes is keyed by (user, route, provider) and tracks
last_pushed_version for the "local newer" UI state.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

packages/db/migrations/0001_wahoo_route_update.sql

@@ -0,0 +1,50 @@
+-- Data migration for the wahoo-route-update change.
+--
+-- Why this lives outside drizzle-kit push:
+-- `drizzle-kit push --force` will happily DROP `route_version` and try to add
+-- the new unique index on (user_id, route_id, provider), but if any user has
+-- successfully pushed multiple versions of a route the duplicate-row check on
+-- the new unique would fail. We need to backfill `last_pushed_version` and
+-- collapse rows BEFORE drizzle-kit reshapes the table.
+--
+-- Idempotent: safe to run before every deploy until the old `route_version`
+-- column is gone. Once `route_version` is dropped (i.e. drizzle-kit push has
+-- run after this script), the body is a no-op.
+
+DO $$
+BEGIN
+  IF EXISTS (
+    SELECT 1
+    FROM information_schema.columns
+    WHERE table_schema = 'journal'
+      AND table_name = 'sync_pushes'
+      AND column_name = 'route_version'
+  ) THEN
+    -- 1. Add the new column (nullable) if drizzle-kit push hasn't yet.
+    ALTER TABLE journal.sync_pushes
+      ADD COLUMN IF NOT EXISTS last_pushed_version integer;
+
+    -- 2. Backfill last_pushed_version from route_version for every row.
+    UPDATE journal.sync_pushes
+    SET last_pushed_version = route_version
+    WHERE last_pushed_version IS NULL;
+
+    -- 3. Collapse rows: per (user_id, route_id, provider), keep the row with
+    --    the highest route_version. Ties broken by created_at desc so we keep
+    --    the most recent. The kept row's remote_id (if any) is the live one.
+    DELETE FROM journal.sync_pushes a
+    USING journal.sync_pushes b
+    WHERE a.user_id = b.user_id
+      AND a.route_id = b.route_id
+      AND a.provider = b.provider
+      AND (
+        a.route_version < b.route_version
+        OR (a.route_version = b.route_version AND a.created_at < b.created_at)
+      );
+
+    -- 4. Drop the old unique index that includes route_version. The new one
+    --    on (user_id, route_id, provider) is created by drizzle-kit push from
+    --    the schema definition.
+    DROP INDEX IF EXISTS journal.sync_pushes_user_route_version_provider_unique;
+  END IF;
+END $$;