#354

backend/db/migrate/20260727123600_add_tags_json_to_post_versions.rb

@@ -30,19 +30,46 @@ class AddTagsJsonToPostVersions < ActiveRecord::Migration[8.0]
     intervals_by_name = build_intervals_by_name
 
     say_with_time 'Backfilling post_versions.tags_json' do
-      MigrationPostVersion
-          .where(tags_json: nil)
-          .find_each(batch_size: 500) do |version|
-        version.update_columns(
-            tags_json: build_tags_json(version, intervals_by_name))
+      MigrationPostVersion.where(tags_json: nil).find_each(batch_size: 500) do |version|
+        version.update_columns(tags_json: build_tags_json(version, intervals_by_name))
       end
     end
 
-    assert_backfill_complete!
     change_column_null :post_versions, :tags_json, false
+
+    schema = connection.quote(JSON.generate({
+        type: 'array',
+        items: { type: 'object',
+                 properties: { id: { type: 'integer', minimum: 1 },
+                               version_no: { type: 'integer', minimum: 1 },
+                               name: { type: 'string', minLength: 1 },
+                               category: { type: 'string', enum: ['deerjikist',
+                                                                  'meme',
+                                                                  'character',
+                                                                  'general',
+                                                                  'material',
+                                                                  'meta',
+                                                                  'nico'] },
+                               sections: { type: 'array',
+                                           items: { type: 'object',
+                                                    properties: { begin_ms: { type: 'integer',
+                                                                              minimum: 0 },
+                                                                  end_ms: { type: ['integer',
+                                                                                   'null'],
+                                                                            minimum: 0 } },
+                                                    required: ['begin_ms', 'end_ms'],
+                                                    additionalProperties: false } } },
+                 required: ['id', 'version_no', 'name', 'category', 'sections'],
+                 additionalProperties: false } }))
+
+    add_check_constraint :post_versions,
+                         "JSON_SCHEMA_VALID(#{ schema }, tags_json)",
+                         name: 'chk_post_versions_tags_json_schema'
   end
 
   def down
+    remove_check_constraint :post_versions, name: 'chk_post_versions_tags_json_schema'
+
     remove_column :post_versions, :tags_json
   end
 
@@ -269,11 +296,4 @@ class AddTagsJsonToPostVersions < ActiveRecord::Migration[8.0]
 
     raise "Duplicate tag IDs: #{ details }"
   end
-
-  def assert_backfill_complete!
-    missing_count = MigrationPostVersion.where(tags_json: nil).count
-    return if missing_count.zero?
-
-    raise "#{ missing_count } post versions were not backfilled"
-  end
 end