diff --git a/backend/prisma/maintenance/clean-database.sql b/backend/prisma/maintenance/clean-database.sql
new file mode 100644
index 00000000..b2121641
--- /dev/null
+++ b/backend/prisma/maintenance/clean-database.sql
@@ -0,0 +1,24 @@
+-- Rensar applikationsdata men behaller kategorier.
+-- Uppdatera den har filen nar nya tabeller tillkommer i schema.prisma.
+
+SET FOREIGN_KEY_CHECKS = 0;
+
+DELETE FROM `FlyerSelection`;
+DELETE FROM `FlyerItem`;
+DELETE FROM `FlyerSession`;
+
+DELETE FROM `ShoppingListItem`;
+DELETE FROM `ShoppingList`;
+
+DELETE FROM `InventoryTransaction`;
+DELETE FROM `InventoryItem`;
+
+DELETE FROM `RecipeIngredient`;
+DELETE FROM `Recipe`;
+
+DELETE FROM `PantryItem`;
+DELETE FROM `MealPlanItem`;
+
+DELETE FROM `Product`;
+
+SET FOREIGN_KEY_CHECKS = 1;
diff --git a/deploy.sh b/deploy.sh
index 12003286..9d4091e5 100755
--- a/deploy.sh
+++ b/deploy.sh
@@ -9,6 +9,8 @@
 #   ./deploy.sh --flutter        – bygg bara flutter web-app
 #   ./deploy.sh --importer       – bygg bara importer-microservice
 #   ./deploy.sh --seed           – kör full seed på databasen (opt-in)
+#   ./deploy.sh --migrate        – kör Prisma-migrationer (opt-in)
+#   ./deploy.sh --clean-database – kör underhålls-SQL som rensar data men behåller kategorier
 #   ./deploy.sh --pull-always    – kontrollera uppdateringar för basimages (flutter:3.41.9, node:24.15.0 etc)
 #   ./deploy.sh --backend --seed – kombinera flaggor fritt (git pull körs alltid)
 
@@ -22,6 +24,8 @@ BUILD_BACKEND=false
 BUILD_FLUTTER=false
 BUILD_IMPORTER=false
 RUN_SEED=false
+RUN_MIGRATE=false
+RUN_CLEAN_DATABASE=false
 PULL_IMAGES=false   # --pull=false är standard (snabbt)
 BUILD_ALL=true      # om inga specifika tjänster anges, bygg allt
 
@@ -31,6 +35,8 @@ for arg in "$@"; do
     --flutter)       BUILD_FLUTTER=true;  BUILD_ALL=false ;;
     --importer)      BUILD_IMPORTER=true; BUILD_ALL=false ;;
     --seed)          RUN_SEED=true ;;
+    --migrate)       RUN_MIGRATE=true; BUILD_BACKEND=true; BUILD_ALL=false ;;
+    --clean-database) RUN_CLEAN_DATABASE=true; BUILD_BACKEND=true; BUILD_ALL=false ;;
     --pull-always)   PULL_IMAGES=true ;;
     --help|-h)
       sed -n '/^# Användning:/,/^[^#]/p' "$0" | grep '^#' | sed 's/^# \?//'
@@ -81,6 +87,42 @@ fi
 echo "Startar tjänster..."
 $COMPOSE up -d
 
+# ── Prisma migreringar och databasrensning (opt-in) ───────────────────────────
+if [ "$RUN_MIGRATE" = true ] || [ "$RUN_CLEAN_DATABASE" = true ]; then
+  CLEAN_SQL_FILE="backend/prisma/maintenance/clean-database.sql"
+
+  echo "Väntar på att backend är redo för Prisma-kommandon..."
+  for i in $(seq 1 30); do
+    if docker exec recipe-api sh -lc "test -f /app/prisma/schema.prisma" >/dev/null 2>&1; then
+      break
+    fi
+    echo "  ...försök $i/30"
+    sleep 2
+  done
+
+  if [ "$RUN_MIGRATE" = true ]; then
+    echo "Kör Prisma-migrationer (deploy)..."
+    docker exec recipe-api sh -lc "cd /app && npx prisma migrate deploy --schema prisma/schema.prisma"
+  fi
+
+  if [ "$RUN_CLEAN_DATABASE" = true ]; then
+    if [ ! -f "$CLEAN_SQL_FILE" ]; then
+      echo "Fel: saknar $CLEAN_SQL_FILE"
+      exit 1
+    fi
+
+    MARIADB_ROOT_PASSWORD=$(grep MARIADB_ROOT_PASSWORD .env | cut -d '=' -f2 | tr -d '"' | tr -d "'")
+    MARIADB_DATABASE=$(grep MARIADB_DATABASE .env | cut -d '=' -f2 | tr -d '"' | tr -d "'")
+
+    echo "Kör databasrensning från $CLEAN_SQL_FILE ..."
+    docker exec -i recipe-db mariadb -uroot -p"$MARIADB_ROOT_PASSWORD" "$MARIADB_DATABASE" < "$CLEAN_SQL_FILE"
+    echo "Databasrensning klar (kategorier bevarade enligt SQL-filen)."
+  fi
+
+  echo "Uppdaterar Prisma Client..."
+  docker exec recipe-api sh -lc "cd /app && npx prisma generate --schema prisma/schema.prisma"
+fi
+
 # ── Seed (opt-in) ─────────────────────────────────────────────────────────────
 if [ "$RUN_SEED" = true ]; then
   MARIADB_ROOT_PASSWORD=$(grep MARIADB_ROOT_PASSWORD .env | cut -d '=' -f2 | tr -d '"' | tr -d "'")