Add NOT NULL constraint to ml_experiment_metadata.project_id column

Changelog: other

db/docs/ml_experiment_metadata.yml

@@ -8,14 +8,6 @@ gitlab_schema: gitlab_main_cell
 description: An Experiment Metadata record holds extra information about the experiment
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/104267
 milestone: '15.7'
-desired_sharding_key:
-  project_id:
-    references: projects
-    backfill_via:
-      parent:
-        foreign_key: experiment_id
-        table: ml_experiments
-        sharding_key: project_id
-        belongs_to: experiment
-desired_sharding_key_migration_job_name: BackfillMlExperimentMetadataProjectId
 table_size: small
+sharding_key:
+  project_id: projects

db/post_migrate/20250108115531_add_ml_experiment_metadata_project_id_not_null_constraint.rb

+# frozen_string_literal: true
+
+class AddMlExperimentMetadataProjectIdNotNullConstraint < Gitlab::Database::Migration[2.2]
+  disable_ddl_transaction!
+  milestone '17.9'
+
+  def up
+    add_not_null_constraint :ml_experiment_metadata, :project_id
+  end
+
+  def down
+    remove_not_null_constraint :ml_experiment_metadata, :project_id
+  end
+end

db/schema_migrations/20250108115531

+4c5c6a0805f9e43ef76364ce1282c88b2a334dbefc6e50b1fe95f0dd4ec85d18
\ No newline at end of file

db/structure.sql

@@ -15448,7 +15448,8 @@ CREATE TABLE ml_experiment_metadata (
     value text NOT NULL,
     project_id bigint,
     CONSTRAINT check_112fe5002d CHECK ((char_length(name) <= 255)),
-    CONSTRAINT check_a91c633d68 CHECK ((char_length(value) <= 5000))
+    CONSTRAINT check_a91c633d68 CHECK ((char_length(value) <= 5000)),
+    CONSTRAINT check_ca9b8315ef CHECK ((project_id IS NOT NULL))
 );
 CREATE SEQUENCE ml_experiment_metadata_id_seq