Change default search rate limits

Changelog: changed

db/migrate/20220322205004_change_search_rate_limit_default_values.rb

+# frozen_string_literal: true
+
+class ChangeSearchRateLimitDefaultValues < Gitlab::Database::Migration[1.0]
+  def change
+    change_column_default :application_settings, :search_rate_limit, from: 30, to: 300
+    change_column_default :application_settings, :search_rate_limit_unauthenticated, from: 10, to: 100
+  end
+end

db/post_migrate/20220322205008_change_search_rate_limit_values.rb

+# frozen_string_literal: true
+
+class ChangeSearchRateLimitValues < Gitlab::Database::Migration[1.0]
+  def up
+    # Change search_rate_limits to a more reasonable value
+    # as long as they are still using the default values.
+    #
+    # The reason why `search_rate_limit` could be either 30 or 60
+    # is because its value was ported over from the now deprecated
+    # `user_email_lookup_limit` which had a default value of 60.
+    execute("update application_settings set search_rate_limit=300 where search_rate_limit IN (30,60)")
+    execute("update application_settings set search_rate_limit_unauthenticated=100 where search_rate_limit_unauthenticated = 10")
+  end
+
+  def down
+    # noop. Because this  migration is updating values, it is not reversible.
+  end
+end

db/schema_migrations/20220322205004

+af69da66a3deb250494204fecf4bc91b4fd10f529ab766746ae98072f54bf245
\ No newline at end of file

db/schema_migrations/20220322205008

+465de916b1c951287a101da37156fb0f59a4bd1cb4ab7076dc48e07e326fa4e4
\ No newline at end of file

db/structure.sql

@@ -11251,8 +11251,8 @@ CREATE TABLE application_settings (
     users_get_by_id_limit integer DEFAULT 300 NOT NULL,
     users_get_by_id_limit_allowlist text[] DEFAULT '{}'::text[] NOT NULL,
     container_registry_expiration_policies_caching boolean DEFAULT true NOT NULL,
-    search_rate_limit integer DEFAULT 30 NOT NULL,
-    search_rate_limit_unauthenticated integer DEFAULT 10 NOT NULL,
+    search_rate_limit integer DEFAULT 300 NOT NULL,
+    search_rate_limit_unauthenticated integer DEFAULT 100 NOT NULL,
     encrypted_database_grafana_api_key bytea,
     encrypted_database_grafana_api_key_iv bytea,
     database_grafana_api_url text,