Activate pgcrypto extension for digest() function in database initialization and migration scripts

backend/sql/add_character_name_to_notification.sql

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+-- Migration script: add_character_name_to_notification.sql
+-- Fügt character_name und character_id zur falukant_log.notification Tabelle hinzu,
+-- legt Index an, erzeugt die Helper-Funktion und den Trigger.
+-- Idempotent und mit Down-Schritten zum Entfernen.
+
+BEGIN;
+
+-- 1) Spalten anlegen
+ALTER TABLE IF EXISTS falukant_log.notification
+  ADD COLUMN IF NOT EXISTS character_name text;
+
+ALTER TABLE IF EXISTS falukant_log.notification
+  ADD COLUMN IF NOT EXISTS character_id integer;
+
+-- 2) Index (idempotent)
+CREATE INDEX IF NOT EXISTS idx_notification_character_id
+  ON falukant_log.notification (character_id);
+
+-- 3) Trigger-Funktion anlegen (idempotent)
+CREATE OR REPLACE FUNCTION falukant_log.populate_notification_character_name()
+RETURNS TRIGGER AS $function$
+DECLARE
+  v_first_name TEXT;
+  v_last_name  TEXT;
+  v_char_id    INTEGER;
+  v_column_exists BOOLEAN;
+BEGIN
+  -- prüfen, ob Zielspalte existiert
+  SELECT EXISTS(
+    SELECT 1 FROM information_schema.columns
+    WHERE table_schema = 'falukant_log' AND table_name = 'notification' AND column_name = 'character_name'
+  ) INTO v_column_exists;
+
+  IF NOT v_column_exists THEN
+    RETURN NEW;
+  END IF;
+
+  IF NEW.character_name IS NOT NULL THEN
+    RETURN NEW;
+  END IF;
+
+  v_char_id := NEW.character_id;
+
+  IF v_char_id IS NULL AND NEW.user_id IS NOT NULL THEN
+    SELECT id INTO v_char_id
+    FROM falukant_data.character
+    WHERE user_id = NEW.user_id
+    ORDER BY id DESC
+    LIMIT 1;
+  END IF;
+
+  IF v_char_id IS NOT NULL THEN
+    SELECT pf.name, pl.name
+    INTO v_first_name, v_last_name
+    FROM falukant_data.character c
+    LEFT JOIN falukant_predefine.firstname pf ON pf.id = c.first_name
+    LEFT JOIN falukant_predefine.lastname pl ON pl.id = c.last_name
+    WHERE c.id = v_char_id;
+
+    IF v_first_name IS NOT NULL OR v_last_name IS NOT NULL THEN
+      NEW.character_name := COALESCE(v_first_name, '') || CASE WHEN v_first_name IS NOT NULL AND v_last_name IS NOT NULL THEN ' ' ELSE '' END || COALESCE(v_last_name, '');
+    ELSE
+      NEW.character_name := ('#' || v_char_id::text);
+    END IF;
+  ELSE
+    IF NEW.user_id IS NOT NULL THEN
+      NEW.character_name := ('#u' || NEW.user_id::text);
+    END IF;
+  END IF;
+
+  RETURN NEW;
+END;
+$function$ LANGUAGE plpgsql;
+
+-- 4) Trigger anlegen (BEFORE INSERT)
+DROP TRIGGER IF EXISTS trg_populate_notification_character_name ON falukant_log.notification;
+CREATE TRIGGER trg_populate_notification_character_name
+BEFORE INSERT ON falukant_log.notification
+FOR EACH ROW
+EXECUTE FUNCTION falukant_log.populate_notification_character_name();
+
+COMMIT;
+
+-- Down / Rollback (falls benötigt):
+-- Die folgenden Statements entfernen Trigger, Funktion, Index und Spalten.
+
+-- Hinweis: Ausführbar separat; zur Anwendung einfach die folgenden Zeilen verwenden:
+-- BEGIN; DROP TRIGGER IF EXISTS trg_populate_notification_character_name ON falukant_log.notification; DROP FUNCTION IF EXISTS falukant_log.populate_notification_character_name(); DROP INDEX IF EXISTS falukant_log.idx_notification_character_id; ALTER TABLE IF EXISTS falukant_log.notification DROP COLUMN IF EXISTS character_name; ALTER TABLE IF EXISTS falukant_log.notification DROP COLUMN IF EXISTS character_id; COMMIT;