feat: Update member table schema to link users and enhance calendar events structure

backend/migrations/20260722_add_member_user_link.sql

@@ -1,4 +1,4 @@
-ALTER TABLE member
-  ADD COLUMN user_id INT NULL,
-  ADD UNIQUE KEY member_user_id_unique (user_id),
-  ADD CONSTRAINT member_user_id_fk FOREIGN KEY (user_id) REFERENCES user(id) ON DELETE SET NULL;
+ALTER TABLE `member`
+  ADD COLUMN `user_id` INT NULL,
+  ADD UNIQUE KEY `member_user_id_unique` (`user_id`),
+  ADD CONSTRAINT `member_user_id_fk` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ON DELETE SET NULL;

backend/migrations/20260724_align_calendar_events_schema.sql

@@ -0,0 +1,11 @@
+-- Ergänzt eine bereits vorhandene ältere calendar_events-Tabelle um die
+-- Felder des aktuellen Kalender-Modells. Bestehende Termine bleiben erhalten.
+ALTER TABLE `calendar_events`
+  ADD COLUMN IF NOT EXISTS `event_type` VARCHAR(32) NOT NULL DEFAULT 'club_event' AFTER `club_id`,
+  ADD COLUMN IF NOT EXISTS `status` VARCHAR(32) NOT NULL DEFAULT 'planning' AFTER `event_type`,
+  ADD COLUMN IF NOT EXISTS `description` TEXT NULL AFTER `title`,
+  ADD COLUMN IF NOT EXISTS `location` VARCHAR(255) NULL AFTER `description`,
+  ADD COLUMN IF NOT EXISTS `registration_deadline` DATE NULL AFTER `end_date`,
+  ADD COLUMN IF NOT EXISTS `organizer_user_id` INT NULL AFTER `registration_deadline`,
+  ADD COLUMN IF NOT EXISTS `category` VARCHAR(64) NULL AFTER `organizer_user_id`,
+  ADD COLUMN IF NOT EXISTS `notes` TEXT NULL AFTER `category`;