rework vehicle handling

backend/src/database/migrations/008_simplify_inspections.sql

@@ -0,0 +1,53 @@
+-- Migration 008: Simplify inspection model
+-- Remove fahrzeug_pruefungen table and related structures.
+-- Only §57a (paragraph57a_faellig_am) and Wartung (naechste_wartung_am)
+-- remain as the two tracked inspection deadlines, stored on fahrzeuge.
+
+-- Drop the pruefungen table (cascades to indexes)
+DROP TABLE IF EXISTS fahrzeug_pruefungen CASCADE;
+
+-- Drop and recreate the fleet overview view (simplified — no CTE)
+DROP VIEW IF EXISTS fahrzeuge_mit_pruefstatus;
+
+CREATE OR REPLACE VIEW fahrzeuge_mit_pruefstatus AS
+SELECT
+    f.id,
+    f.bezeichnung,
+    f.kurzname,
+    f.amtliches_kennzeichen,
+    f.fahrgestellnummer,
+    f.baujahr,
+    f.hersteller,
+    f.typ_schluessel,
+    f.besatzung_soll,
+    f.status,
+    f.status_bemerkung,
+    f.standort,
+    f.bild_url,
+    f.created_at,
+    f.updated_at,
+    f.paragraph57a_faellig_am,
+    CASE
+        WHEN f.paragraph57a_faellig_am IS NOT NULL
+        THEN f.paragraph57a_faellig_am::date - CURRENT_DATE
+        ELSE NULL
+    END AS paragraph57a_tage_bis_faelligkeit,
+    f.naechste_wartung_am,
+    CASE
+        WHEN f.naechste_wartung_am IS NOT NULL
+        THEN f.naechste_wartung_am::date - CURRENT_DATE
+        ELSE NULL
+    END AS wartung_tage_bis_faelligkeit,
+    LEAST(
+        CASE WHEN f.paragraph57a_faellig_am IS NOT NULL
+             THEN f.paragraph57a_faellig_am::date - CURRENT_DATE
+             ELSE NULL END,
+        CASE WHEN f.naechste_wartung_am IS NOT NULL
+             THEN f.naechste_wartung_am::date - CURRENT_DATE
+             ELSE NULL END
+    ) AS naechste_pruefung_tage
+FROM fahrzeuge f;
+
+-- Index support for alert queries
+CREATE INDEX IF NOT EXISTS idx_fahrzeuge_paragraph57a ON fahrzeuge(paragraph57a_faellig_am) WHERE paragraph57a_faellig_am IS NOT NULL;
+CREATE INDEX IF NOT EXISTS idx_fahrzeuge_wartung ON fahrzeuge(naechste_wartung_am) WHERE naechste_wartung_am IS NOT NULL;

backend/src/database/migrations/009_vehicle_soft_delete.sql

@@ -0,0 +1,57 @@
+-- Migration 009: Soft delete for vehicles
+-- Adds deleted_at to fahrzeuge and refreshes the view to exclude soft-deleted rows.
+-- Hard DELETE is replaced by UPDATE SET deleted_at = NOW() in the service layer.
+
+ALTER TABLE fahrzeuge
+    ADD COLUMN IF NOT EXISTS deleted_at TIMESTAMPTZ;
+
+COMMENT ON COLUMN fahrzeuge.deleted_at IS
+    'NULL = active vehicle. Set to timestamp when soft-deleted. Records are never physically removed.';
+
+-- Partial index: only index active (non-deleted) vehicles for fast lookups
+CREATE INDEX IF NOT EXISTS idx_fahrzeuge_active
+    ON fahrzeuge(id)
+    WHERE deleted_at IS NULL;
+
+-- Refresh the view to exclude soft-deleted vehicles
+DROP VIEW IF EXISTS fahrzeuge_mit_pruefstatus;
+
+CREATE OR REPLACE VIEW fahrzeuge_mit_pruefstatus AS
+SELECT
+    f.id,
+    f.bezeichnung,
+    f.kurzname,
+    f.amtliches_kennzeichen,
+    f.fahrgestellnummer,
+    f.baujahr,
+    f.hersteller,
+    f.typ_schluessel,
+    f.besatzung_soll,
+    f.status,
+    f.status_bemerkung,
+    f.standort,
+    f.bild_url,
+    f.created_at,
+    f.updated_at,
+    f.paragraph57a_faellig_am,
+    CASE
+        WHEN f.paragraph57a_faellig_am IS NOT NULL
+        THEN f.paragraph57a_faellig_am::date - CURRENT_DATE
+        ELSE NULL
+    END AS paragraph57a_tage_bis_faelligkeit,
+    f.naechste_wartung_am,
+    CASE
+        WHEN f.naechste_wartung_am IS NOT NULL
+        THEN f.naechste_wartung_am::date - CURRENT_DATE
+        ELSE NULL
+    END AS wartung_tage_bis_faelligkeit,
+    LEAST(
+        CASE WHEN f.paragraph57a_faellig_am IS NOT NULL
+             THEN f.paragraph57a_faellig_am::date - CURRENT_DATE
+             ELSE NULL END,
+        CASE WHEN f.naechste_wartung_am IS NOT NULL
+             THEN f.naechste_wartung_am::date - CURRENT_DATE
+             ELSE NULL END
+    ) AS naechste_pruefung_tage
+FROM fahrzeuge f
+WHERE f.deleted_at IS NULL;