diff --git a/db/post_migrate/20250829190715_drop_unneeded_sequences.rb b/db/post_migrate/20250829190715_drop_unneeded_sequences.rb
new file mode 100644
index 0000000000000000000000000000000000000000..fa1d4738b8388bc0720ea304ef9c6a5405b1ea5d
--- /dev/null
+++ b/db/post_migrate/20250829190715_drop_unneeded_sequences.rb
@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+class DropUnneededSequences < Gitlab::Database::Migration[2.3]
+  disable_ddl_transaction!
+  milestone '18.4'
+
+  def up
+    drop_sequence(:project_incident_management_settings, :project_id,
+      :project_incident_management_settings_project_id_seq)
+    drop_sequence(:user_statuses, :user_id, :user_statuses_user_id_seq)
+  end
+
+  # NOP because these sequences were never used, and re-adding them
+  # causes the columns to be altered to use them as default values.
+  def down; end
+end
diff --git a/db/schema_migrations/20250829190715 b/db/schema_migrations/20250829190715
new file mode 100644
index 0000000000000000000000000000000000000000..32b079ba65ab2e6d1fe516659795412d6cbc46e1
--- /dev/null
+++ b/db/schema_migrations/20250829190715
@@ -0,0 +1 @@
+e6a533e0e5a527061a339d742ea2783853b357c047ec1233cafa3fa81a17f2b1
\ No newline at end of file
diff --git a/db/structure.sql b/db/structure.sql
index 2bf04772a30911f6bbf2f4bc73910147fdd20345..c19418f40bd3707ed31562c7975093d8124daf86 100644
--- a/db/structure.sql
+++ b/db/structure.sql
@@ -22745,15 +22745,6 @@ CREATE TABLE project_incident_management_settings (
     CONSTRAINT pagerduty_token_length_constraint CHECK ((octet_length(encrypted_pagerduty_token) <= 255))
 );
 
-CREATE SEQUENCE project_incident_management_settings_project_id_seq
-    START WITH 1
-    INCREMENT BY 1
-    NO MINVALUE
-    NO MAXVALUE
-    CACHE 1;
-
-ALTER SEQUENCE project_incident_management_settings_project_id_seq OWNED BY project_incident_management_settings.project_id;
-
 CREATE TABLE project_metrics_settings (
     project_id bigint NOT NULL,
     external_dashboard_url character varying,
@@ -26344,15 +26335,6 @@ CREATE TABLE user_statuses (
     clear_status_at timestamp with time zone
 );
 
-CREATE SEQUENCE user_statuses_user_id_seq
-    START WITH 1
-    INCREMENT BY 1
-    NO MINVALUE
-    NO MAXVALUE
-    CACHE 1;
-
-ALTER SEQUENCE user_statuses_user_id_seq OWNED BY user_statuses.user_id;
-
 CREATE TABLE user_synced_attributes_metadata (
     id bigint NOT NULL,
     name_synced boolean DEFAULT false,
@@ -29983,8 +29965,6 @@ ALTER TABLE ONLY project_group_links ALTER COLUMN id SET DEFAULT nextval('projec
 
 ALTER TABLE ONLY project_import_data ALTER COLUMN id SET DEFAULT nextval('project_import_data_id_seq'::regclass);
 
-ALTER TABLE ONLY project_incident_management_settings ALTER COLUMN project_id SET DEFAULT nextval('project_incident_management_settings_project_id_seq'::regclass);
-
 ALTER TABLE ONLY project_mirror_data ALTER COLUMN id SET DEFAULT nextval('project_mirror_data_id_seq'::regclass);
 
 ALTER TABLE ONLY project_relation_export_uploads ALTER COLUMN id SET DEFAULT nextval('project_relation_export_uploads_id_seq'::regclass);
@@ -30275,8 +30255,6 @@ ALTER TABLE ONLY user_preferences ALTER COLUMN id SET DEFAULT nextval('user_pref
 
 ALTER TABLE ONLY user_project_callouts ALTER COLUMN id SET DEFAULT nextval('user_project_callouts_id_seq'::regclass);
 
-ALTER TABLE ONLY user_statuses ALTER COLUMN user_id SET DEFAULT nextval('user_statuses_user_id_seq'::regclass);
-
 ALTER TABLE ONLY user_synced_attributes_metadata ALTER COLUMN id SET DEFAULT nextval('user_synced_attributes_metadata_id_seq'::regclass);
 
 ALTER TABLE ONLY users ALTER COLUMN id SET DEFAULT nextval('users_id_seq'::regclass);