Merge branch 'refactor/db-not-null-constraints-for-config' into 'develop'

Add NOT NULL constraints for config table

See merge request pleroma/pleroma!1892

priv/repo/migrations/20191026190622_set_not_null_for_config.exs

@@ -0,0 +1,17 @@
+defmodule Pleroma.Repo.Migrations.SetNotNullForConfig do
+  use Ecto.Migration
+
+  # modify/3 function will require index recreation, so using execute/1 instead
+
+  def up do
+    execute("ALTER TABLE config
+    ALTER COLUMN key SET NOT NULL,
+    ALTER COLUMN value SET NOT NULL")
+  end
+
+  def down do
+    execute("ALTER TABLE config
+    ALTER COLUMN key DROP NOT NULL,
+    ALTER COLUMN value DROP NOT NULL")
+  end
+end