diff --git a/litecord/blueprints/invites.py b/litecord/blueprints/invites.py
index aa7dc99..a1ca0f8 100644
--- a/litecord/blueprints/invites.py
+++ b/litecord/blueprints/invites.py
@@ -109,6 +109,8 @@ async def _inv_check_age(inv: dict):
     if inv["max_age"] == 0:
         return
 
+    # TODO: also verify when max_uses is 0
+
     now = datetime.datetime.utcnow()
     delta_sec = (now - inv["created_at"]).total_seconds()
 
diff --git a/manage/cmd/migration/scripts/0_base.sql b/manage/cmd/migration/scripts/0_base.sql
index 857402e..873bded 100644
--- a/manage/cmd/migration/scripts/0_base.sql
+++ b/manage/cmd/migration/scripts/0_base.sql
@@ -414,6 +414,9 @@ CREATE TABLE IF NOT EXISTS guild_voice_channels (
 
 
 CREATE TABLE IF NOT EXISTS guild_settings (
+    -- NOTE: migration 13 fixes table constraints to point to
+    -- members instead of users this prevents descynrhonization
+    -- on a member leave/kick/ban
     user_id bigint REFERENCES users (id) ON DELETE CASCADE,
     guild_id bigint REFERENCES guilds (id) ON DELETE CASCADE,
 
@@ -578,6 +581,9 @@ CREATE TABLE IF NOT EXISTS channel_overwrites (
     -- makes us able to remove the channel overwrites of
     -- a role when its deleted (same for users, etc).
     target_role bigint REFERENCES roles (id) ON DELETE CASCADE,
+    -- NOTE: migration 13 fixes table constraints to point to
+    -- members instead of users this prevents descynrhonization
+    -- on a member leave/kick/ban
     target_user bigint REFERENCES users (id) ON DELETE CASCADE,
 
     -- since those are permission bit sets
@@ -605,6 +611,9 @@ CREATE TABLE IF NOT EXISTS guild_whitelists (
 
 /* Represents a role a member has. */
 CREATE TABLE IF NOT EXISTS member_roles (
+    -- NOTE: migration 13 fixes table constraints to point to
+    -- members instead of users this prevents descynrhonization
+    -- on a member leave/kick/ban
     user_id bigint REFERENCES users (id) ON DELETE CASCADE,
     guild_id bigint REFERENCES guilds (id) ON DELETE CASCADE,
     role_id bigint REFERENCES roles (id) ON DELETE CASCADE,
diff --git a/manage/cmd/migration/scripts/13_fix_member_foreign_key.sql b/manage/cmd/migration/scripts/13_fix_member_foreign_key.sql
new file mode 100644
index 0000000..614daaa
--- /dev/null
+++ b/manage/cmd/migration/scripts/13_fix_member_foreign_key.sql
@@ -0,0 +1,60 @@
+BEGIN TRANSACTION;
+
+DELETE
+FROM guild_settings
+WHERE NOT EXISTS(
+    SELECT members.user_id
+    FROM members
+    WHERE members.user_id = guild_settings.user_id
+        AND members.guild_id = guild_settings.guild_id
+);
+
+ALTER TABLE guild_settings
+    DROP CONSTRAINT IF EXISTS guild_settings_user_id_fkey,
+    DROP CONSTRAINT IF EXISTS guild_settings_guild_id_fkey,
+    ADD CONSTRAINT guild_settings_user_id_guild_id_fkey
+        FOREIGN KEY (user_id, guild_id)
+        REFERENCES members (user_id, guild_id)
+        ON DELETE CASCADE;
+
+DELETE
+FROM member_roles
+WHERE NOT EXISTS(
+    SELECT members.user_id
+    FROM members
+    WHERE members.user_id = member_roles.user_id
+        AND members.guild_id = member_roles.guild_id
+);
+
+ALTER TABLE member_roles
+    DROP CONSTRAINT IF EXISTS member_roles_user_id_fkey,
+    DROP CONSTRAINT IF EXISTS member_roles_guild_id_fkey,
+    ADD CONSTRAINT member_roles_user_id_guild_id_fkey
+        FOREIGN KEY (user_id, guild_id)
+        REFERENCES members (user_id, guild_id)
+        ON DELETE CASCADE;
+
+-- To make channel_overwrites aware of guilds, we need to backfill the column
+-- with data from the guild_channels table. after that, we can make a proper
+-- foreign key to the members table!
+
+ALTER TABLE channel_overwrites
+    ADD COLUMN guild_id bigint DEFAULT NULL;
+
+UPDATE channel_overwrites 
+    SET guild_id = guild_channels.guild_id 
+    FROM guild_channels
+    WHERE guild_channels.id = channel_overwrites.channel_id;
+
+ALTER TABLE channel_overwrites
+    ALTER COLUMN guild_id DROP DEFAULT,
+    ALTER COLUMN guild_id SET NOT NULL;
+
+ALTER TABLE channel_overwrites
+    DROP CONSTRAINT IF EXISTS channel_overwrites_target_user_fkey,
+    ADD CONSTRAINT channel_overwrites_target_user_guild_id_fkey
+        FOREIGN KEY (target_user, guild_id)
+        REFERENCES members (user_id, guild_id)
+        ON DELETE CASCADE;
+
+COMMIT;