fix: CREATE OR REPLACE TRIGGER (idempotent), FK-Indizes für campaign_recipients und campaign_triggers

migrations/pg/2026-04-17_campaigns.sql

@@ -25,6 +25,8 @@ CREATE TABLE IF NOT EXISTS campaign_recipients (
   )
 );
 
+CREATE INDEX IF NOT EXISTS idx_campaign_recipients_campaign_id ON campaign_recipients(campaign_id);
+
 CREATE TABLE IF NOT EXISTS campaign_triggers (
   id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
   campaign_id UUID NOT NULL REFERENCES campaigns(id) ON DELETE CASCADE,
@@ -32,11 +34,13 @@ CREATE TABLE IF NOT EXISTS campaign_triggers (
   trigger_value TEXT NOT NULL
 );
 
+CREATE INDEX IF NOT EXISTS idx_campaign_triggers_campaign_id ON campaign_triggers(campaign_id);
+
 CREATE OR REPLACE FUNCTION update_updated_at()
 RETURNS TRIGGER AS $$
 BEGIN NEW.updated_at = now(); RETURN NEW; END;
 $$ LANGUAGE plpgsql;
 
-CREATE TRIGGER campaigns_updated_at
+CREATE OR REPLACE TRIGGER campaigns_updated_at
   BEFORE UPDATE ON campaigns
   FOR EACH ROW EXECUTE FUNCTION update_updated_at();