add features

backend/src/database/migrations/020_create_notifications.sql

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+-- Migration 020: Create notifications table
+CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
+
+CREATE TABLE IF NOT EXISTS notifications (
+    id          UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    user_id     UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    typ         VARCHAR(50)  NOT NULL,
+    titel       VARCHAR(500) NOT NULL,
+    nachricht   TEXT         NOT NULL,
+    schwere     VARCHAR(20)  NOT NULL DEFAULT 'info'
+                    CHECK (schwere IN ('info', 'warnung', 'fehler')),
+    gelesen     BOOLEAN      NOT NULL DEFAULT FALSE,
+    gelesen_am  TIMESTAMPTZ,
+    link        VARCHAR(500),
+    quell_id    VARCHAR(100),
+    quell_typ   VARCHAR(50),
+    erstellt_am TIMESTAMPTZ  NOT NULL DEFAULT NOW()
+);
+
+-- Fast lookup for unread badge count
+CREATE INDEX IF NOT EXISTS notifications_user_unread_idx
+    ON notifications (user_id, gelesen)
+    WHERE NOT gelesen;
+
+-- Fast lookup for notification list ordered by date
+CREATE INDEX IF NOT EXISTS notifications_user_date_idx
+    ON notifications (user_id, erstellt_am DESC);
+
+-- Dedup index: one unread notification per (user, source type, source id)
+CREATE UNIQUE INDEX IF NOT EXISTS notifications_dedup_idx
+    ON notifications (user_id, quell_typ, quell_id)
+    WHERE NOT gelesen AND quell_typ IS NOT NULL AND quell_id IS NOT NULL;

backend/src/database/migrations/021_add_motorisiert_to_ausruestung_kategorien.sql

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+-- Migration 021: Add motorisiert flag to ausruestung_kategorien
+-- Motorized equipment (motorisiert = TRUE)  → managed by fahrmeister
+-- Non-motorized equipment (motorisiert = FALSE) → managed by zeugmeister
+
+ALTER TABLE ausruestung_kategorien
+    ADD COLUMN IF NOT EXISTS motorisiert BOOLEAN NOT NULL DEFAULT FALSE;
+
+-- Recreate the helper view to include the new column
+CREATE OR REPLACE VIEW ausruestung_mit_pruefstatus AS
+SELECT
+    a.*,
+    k.name      AS kategorie_name,
+    k.kurzname  AS kategorie_kurzname,
+    k.motorisiert AS kategorie_motorisiert,
+    f.bezeichnung AS fahrzeug_bezeichnung,
+    f.kurzname    AS fahrzeug_kurzname,
+    CASE
+        WHEN a.naechste_pruefung_am IS NOT NULL
+        THEN a.naechste_pruefung_am::date - CURRENT_DATE
+        ELSE NULL
+    END AS pruefung_tage_bis_faelligkeit
+FROM ausruestung a
+JOIN ausruestung_kategorien k ON k.id = a.kategorie_id
+LEFT JOIN fahrzeuge f ON f.id = a.fahrzeug_id AND f.deleted_at IS NULL
+WHERE a.deleted_at IS NULL;

backend/src/database/migrations/022_add_alle_gruppen_to_kategorien.sql

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+-- Migration 022: Add alle_gruppen flag to veranstaltung_kategorien
+-- When alle_gruppen = TRUE, selecting this category auto-fills
+-- the event's alle_gruppen = TRUE and clears individual zielgruppen.
+
+ALTER TABLE veranstaltung_kategorien
+    ADD COLUMN IF NOT EXISTS alle_gruppen BOOLEAN NOT NULL DEFAULT FALSE;