minor db adjustments

db/init.sql

@@ -56,7 +56,7 @@ CREATE TABLE IF NOT EXISTS message_ (
   sent_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
 );
 
-CREATE TABLE message_attachment_ (
+CREATE TABLE IF NOT EXISTS message_attachment_ (
     id SERIAL PRIMARY KEY,
     uuid UUID NOT NULL UNIQUE,
     message_uuid UUID NOT NULL REFERENCES message_(uuid),
@@ -64,15 +64,15 @@ CREATE TABLE message_attachment_ (
     file_name TEXT NOT NULL
 );
 
-CREATE TABLE ws_token_ (
+CREATE TABLE IF NOT EXISTS ws_token_ (
   token TEXT PRIMARY KEY,
   expires_at TIMESTAMPTZ NOT NULL
 );
 
 -- ==== INDICES ====
-CREATE INDEX idx_message_room_sent_at ON message_ (room, sent_at);
-CREATE UNIQUE INDEX idx_membership_user_room ON membership_ (user_id, room) INCLUDE (last_read_at);
-CREATE INDEX idx_attachment_message ON message_attachment_(message_uuid);
+CREATE INDEX IF NOT EXISTS idx_message_room_sent_at ON message_ (room, sent_at);
+CREATE UNIQUE INDEX IF NOT EXISTS idx_membership_user_room ON membership_ (user_id, room) INCLUDE (last_read_at);
+CREATE INDEX IF NOT EXISTS idx_attachment_message ON message_attachment_(message_uuid);
 
 -- Timestamp creation
 -- CREATE OR REPLACE FUNCTION create_notification_timestamp()