feat(db): allow specifying up/down migrations

.github/workflows/ci.yml

@@ -120,6 +120,79 @@ jobs:
         cd my-app
         cargo test --all
 
+  rollback-generated-full:
+    name: "Test rollback on generated full example app"
+    runs-on: ubuntu-latest
+    needs: generate-full
+
+    services:
+      postgres:
+        image: postgres
+        env:
+          POSTGRES_DB: my_app
+          POSTGRES_USER: my_app
+          POSTGRES_PASSWORD: my_app
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 5432:5432
+      postgres_test:
+        image: postgres
+        env:
+          POSTGRES_DB: my_app_test
+          POSTGRES_USER: my_app_test
+          POSTGRES_PASSWORD: my_app_test
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 5433:5432
+
+    steps:
+    - uses: actions/checkout@v5
+    - uses: actions-rust-lang/setup-rust-toolchain@v1
+
+    - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
+      with:
+        name: my-app-full
+        path: my-app
+
+    - name: migrate
+      run: |
+        cd my-app
+        cargo db reset
+        cargo db reset -e test
+
+    - name: test rollback without args (last 1)
+      run: |
+        cd my-app
+        cargo db rollback
+        cargo db rollback -e test
+        ! cargo test --all
+    - name: test rollback (last 2)
+      run: |
+        cd my-app
+        cargo db migrate
+        cargo db migrate -e test
+        cargo test --all
+        cargo db rollback --steps 2
+        cargo db rollback --steps 2 -e test
+        ! cargo test --all
+    - name: test rollback to tasks
+      run: |
+        cd my-app
+        cargo db migrate
+        cargo db migrate -e test
+        cargo test --all
+        cargo db rollback --to create_tasks_table
+        cargo db rollback --to create_tasks_table -e test
+        ! cargo test --all
+
   fmt-generated-full:
     name: "Validate format of generated full example app"
     runs-on: ubuntu-latest
@@ -468,6 +541,7 @@ jobs:
       run: |
         cd my-app
         cargo generate migration CreatePeopleTable
+        cargo generate migration AddIndexToPeople --simple
 
     - name: generate-entity
       run: |