diff --git a/ntfy-daemon/src/message_repo/migrations/02.sql b/ntfy-daemon/src/message_repo/migrations/02.sql
index de049ec..9713e33 100644
--- a/ntfy-daemon/src/message_repo/migrations/02.sql
+++ b/ntfy-daemon/src/message_repo/migrations/02.sql
@@ -1,3 +1,3 @@
-ALTER TABLE message ADD COLUMN timestamp INTEGER AS (data ->> '$.time') STORED;
+ALTER TABLE message ADD COLUMN IF NOT EXISTS timestamp INTEGER AS (data ->> '$.time') STORED;
 
 CREATE INDEX IF NOT EXISTS message_server_topic_timestamp ON message (server, topic, timestamp);
diff --git a/ntfy-daemon/src/message_repo/migrations/03.sql b/ntfy-daemon/src/message_repo/migrations/03.sql
index 5c2ea84..c4431e8 100644
--- a/ntfy-daemon/src/message_repo/migrations/03.sql
+++ b/ntfy-daemon/src/message_repo/migrations/03.sql
@@ -1 +1 @@
-ALTER TABLE subscription ADD COLUMN retention_hours INTEGER DEFAULT 0;
+ALTER TABLE subscription ADD COLUMN IF NOT EXISTS retention_hours INTEGER DEFAULT 0;