diff --git a/.env.example b/.env.example
index 5266799..f35f847 100644
--- a/.env.example
+++ b/.env.example
@@ -36,4 +36,32 @@ USE_ETAGS=True
 PRAGMA_HEADER=
 
 # Wartość nagłówka X-Robots-Tag, gdy BLOCK_BOTS=True
-ROBOTS_TAG=noindex, nofollow, nosnippet, noarchive
+ROBOTS_TAG="noindex, nofollow, nosnippet, noarchive"
+
+
+# Rodzaj bazy: sqlite, pgsql, mysql
+# Mozliwe wartosci: sqlite / pgsql / mysql
+DB_ENGINE=sqlite
+
+# --- Konfiguracja dla sqlite ---
+# Plik bazy bedzie utworzony automatycznie w katalogu ./instance
+# Pozostale zmienne sa ignorowane przy DB_ENGINE=sqlite
+
+# --- Konfiguracja dla pgsql ---
+# Ustaw DB_ENGINE=pgsql
+# Domyslny port PostgreSQL to 5432
+# Wymaga dzialajacego serwera PostgreSQL (np. kontener `postgres`)
+
+# --- Konfiguracja dla mysql ---
+# Ustaw DB_ENGINE=mysql
+# Domyslny port MySQL to 3306
+# Wymaga kontenera z MySQL i uzytkownika z dostepem do bazy
+
+# Wspolne zmienne (dla pgsql, mysql)
+# DB_HOST = pgsql lub mysql zgodnie z deployem (profil w docker-compose.yml)
+
+DB_HOST=pgsql 
+DB_PORT=5432
+DB_NAME=myapp
+DB_USER=user
+DB_PASSWORD=pass
diff --git a/.gitignore b/.gitignore
index f825246..2b3d7ec 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,4 +5,5 @@ venv/
 .env
 version.txt
 deploy/varnish/default.vcl
-*.tar.gz
\ No newline at end of file
+*.tar.gz
+db/*
\ No newline at end of file
diff --git a/_tools/db/migrate.txt b/_tools/db/migrate.txt
new file mode 100644
index 0000000..399ed5a
--- /dev/null
+++ b/_tools/db/migrate.txt
@@ -0,0 +1,38 @@
+python3 -m venv venv_migrate
+source venv_migrate/bin/activate  
+pip install sqlalchemy psycopg2-binary dotenv 
+docker compose --profile pgsql up -d --build
+PYTHONPATH=. python3 _tools/db/migrate_sqlite_to_pgsql.py 
+rm -rf venv_migrate
+
+# reset wszystkich sekwencji w pgsql
+docker exec -it pgsql-db psql -U zbiorki -d zbiorki
+
+
+DO $$
+DECLARE
+    r RECORD;
+BEGIN
+    FOR r IN
+        SELECT 
+            c.relname AS seq_name,
+            t.relname AS table_name,
+            a.attname AS column_name
+        FROM 
+            pg_class c
+        JOIN 
+            pg_depend d ON d.objid = c.oid
+        JOIN 
+            pg_class t ON d.refobjid = t.oid
+        JOIN 
+            pg_attribute a ON a.attrelid = t.oid AND a.attnum = d.refobjsubid
+        WHERE 
+            c.relkind = 'S'
+            AND d.deptype = 'a'
+    LOOP
+        EXECUTE format(
+            'SELECT setval(%L, COALESCE((SELECT MAX(%I) FROM %I), 1), true)',
+            r.seq_name, r.column_name, r.table_name
+        );
+    END LOOP;
+END$$;
\ No newline at end of file
diff --git a/_tools/db/migrate_sqlite_to_pgsql.py b/_tools/db/migrate_sqlite_to_pgsql.py
new file mode 100644
index 0000000..e49728d
--- /dev/null
+++ b/_tools/db/migrate_sqlite_to_pgsql.py
@@ -0,0 +1,61 @@
+import sys
+import os
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "../../")))
+
+from sqlalchemy import create_engine, MetaData
+from sqlalchemy.orm import sessionmaker
+from config import Config
+from dotenv import load_dotenv
+load_dotenv()
+
+# Źródło: SQLite
+sqlite_engine = create_engine("sqlite:///instance/baza.db")
+sqlite_meta = MetaData()
+sqlite_meta.reflect(bind=sqlite_engine)
+
+# Cel: PostgreSQL
+pg_engine = create_engine(Config.SQLALCHEMY_DATABASE_URI)
+pg_meta = MetaData()
+pg_meta.reflect(bind=pg_engine)
+
+# Sesje
+SQLiteSession = sessionmaker(bind=sqlite_engine)
+PGSession = sessionmaker(bind=pg_engine)
+
+sqlite_session = SQLiteSession()
+pg_session = PGSession()
+
+def migrate_table(table_name):
+    print("➡️  Używana baza docelowa:", Config.SQLALCHEMY_DATABASE_URI)
+    print(f"\n➡️  Migruję tabelę: {table_name}")
+    source_table = sqlite_meta.tables.get(table_name)
+    target_table = pg_meta.tables.get(table_name)
+
+    if source_table is None or target_table is None:
+        print(f"⚠️  Pominięto: {table_name} (brak w jednej z baz)")
+        return
+
+    rows = sqlite_session.execute(source_table.select()).fetchall()
+    if not rows:
+        print("ℹ️  Brak danych do migracji.")
+        return
+
+    insert_data = [dict(row._mapping) for row in rows]
+
+    try:
+        with pg_engine.begin() as conn:
+            conn.execute(target_table.delete())
+            conn.execute(target_table.insert(), insert_data)
+        print(f"✅ Przeniesiono: {len(rows)} rekordów")
+    except Exception as e:
+        print(f"❌ Błąd przy migracji {table_name}: {e}")
+
+
+def main():
+    tables = ["user", "shopping_list", "item", "expense", "receipt", "suggested_product"]
+    for table in tables:
+        migrate_table(table)
+    print("\n🎉 Migracja zakończona pomyślnie.")
+
+if __name__ == "__main__":
+    main()
diff --git a/config.py b/config.py
index 87bf745..ac25c76 100644
--- a/config.py
+++ b/config.py
@@ -1,5 +1,7 @@
 import os
 
+basedir = os.path.abspath(os.path.dirname(__file__))
+
 def _get_bool(name: str, default: bool) -> bool:
     val = os.environ.get(name)
     if val is None:
@@ -24,8 +26,8 @@ class Config:
       - ROBOTS_TAG
     """
 
-    # Baza danych
-    SQLALCHEMY_DATABASE_URI = _get_str("DATABASE_URL", "sqlite:///baza.db")
+
+    #SQLALCHEMY_DATABASE_URI = _get_str("DATABASE_URL", "sqlite:///baza.db")
 
     # Flask
     SECRET_KEY = _get_str("SECRET_KEY", "tajny_klucz")
@@ -48,4 +50,22 @@ class Config:
     # (opcjonalnie) wyłącz warningi track_modifications
     SQLALCHEMY_TRACK_MODIFICATIONS = False
 
-    HEALTHCHECK_TOKEN = _get_str("HEALTHCHECK_TOKEN", "healthcheck")
\ No newline at end of file
+    HEALTHCHECK_TOKEN = _get_str("HEALTHCHECK_TOKEN", "healthcheck")
+
+    # Baza danych
+    DB_ENGINE = os.environ.get("DB_ENGINE", "sqlite").lower()
+
+    if DB_ENGINE == "sqlite":
+        SQLALCHEMY_DATABASE_URI = f"sqlite:///{os.path.join(basedir, 'db', 'database.db')}"
+    elif DB_ENGINE == "pgsql":
+        SQLALCHEMY_DATABASE_URI = (
+            f"postgresql://{os.environ['DB_USER']}:{os.environ['DB_PASSWORD']}@"
+            f"{os.environ['DB_HOST']}:{os.environ.get('DB_PORT', 5432)}/{os.environ['DB_NAME']}"
+        )
+    elif DB_ENGINE == "mysql":
+        SQLALCHEMY_DATABASE_URI = (
+            f"mysql+pymysql://{os.environ['DB_USER']}:{os.environ['DB_PASSWORD']}@"
+            f"{os.environ['DB_HOST']}:{os.environ.get('DB_PORT', 3306)}/{os.environ['DB_NAME']}"
+        )
+    else:
+        raise ValueError("Nieobsługiwany typ bazy danych.")
\ No newline at end of file
diff --git a/deploy.sh b/deploy.sh
index 2761d0f..dc7003e 100755
--- a/deploy.sh
+++ b/deploy.sh
@@ -10,23 +10,30 @@ fi
 
 APP_PORT="${APP_PORT:-8080}"
 
-
-# === Konfiguracja (możesz nadpisać zmiennymi środowiskowymi) ===
 REPO_DIR="${REPO_DIR:-$(pwd)}"
-COMPOSE_FILE="${COMPOSE_FILE:-docker-compose.yml}"   # albo compose.yaml
+COMPOSE_FILE="${COMPOSE_FILE:-docker-compose.yml}"
 GIT_REMOTE="${GIT_REMOTE:-origin}"
 GIT_BRANCH="${GIT_BRANCH:-$(git -C "$REPO_DIR" rev-parse --abbrev-ref HEAD 2>/dev/null || echo main)}"
 
-# Jeśli chcesz uruchomić tylko wybrane serwisy, podaj je po komendzie,
-# np.: ./deploy.sh web api
-SERVICES=("$@")
+# Domyślny profil i usługi
+DB_PROFILE="sqlite"  # domyślnie sqlite, czyli brak profilu pgsql/mysql
+SERVICES=()
+
+# Przetwarzanie argumentów
+if [[ $# -gt 0 ]]; then
+  case "$1" in
+    pgsql|mysql|sqlite)
+      DB_PROFILE="$1"
+      shift
+      ;;
+  esac
+  SERVICES=("$@")
+fi
 
 log() { printf "\n==> %s\n" "$*"; }
 
-# --- Kontrole wstępne ---
 command -v git >/dev/null || { echo "Brak 'git' w PATH"; exit 1; }
 command -v docker >/dev/null || { echo "Brak 'docker' w PATH"; exit 1; }
-
 if ! docker compose version >/dev/null 2>&1; then
   echo "Wymagany jest 'docker compose' (plugin), nie stary 'docker-compose'."
   exit 1
@@ -41,34 +48,37 @@ if [[ ! -f "$REPO_DIR/$COMPOSE_FILE" ]]; then
   fi
 fi
 
-# --- Praca w katalogu repo ---
 cd "$REPO_DIR"
 
-# --- Aktualizacja kodu ---
 log "Aktualizacja repo: git pull --ff-only ($GIT_REMOTE/$GIT_BRANCH)"
 git fetch --prune "$GIT_REMOTE"
 git checkout "$GIT_BRANCH" >/dev/null 2>&1 || true
 git pull --ff-only "$GIT_REMOTE" "$GIT_BRANCH"
 
-# --- Zapisanie wersji do pliku ---
 log "Zapisywanie hasha commita do version.txt"
 git rev-parse --short HEAD > version.txt
 
-# --- Zatrzymanie i usunięcie bieżącego stacka ---
 log "Docker Compose DOWN (usuwanie kontenerów i osieroconych usług)"
 docker compose -f "$COMPOSE_FILE" down --remove-orphans
 
-
-# --- Generowanie default.vcl z szablonu ---
 log "Generowanie default.vcl z APP_PORT=$APP_PORT"
 envsubst < deploy/varnish/default.vcl.template > deploy/varnish/default.vcl
 
-# --- Budowanie i uruchamianie bez restartu zależności ---
-log "Docker Compose UP (build bez deps) dla: ${SERVICES[*]:-(wszystkie)}"
-if [[ ${#SERVICES[@]} -gt 0 ]]; then
-  docker compose -f "$COMPOSE_FILE" up -d --no-deps --build "${SERVICES[@]}"
+# Budowanie i uruchamianie
+log "Docker Compose UP (build bez deps) dla profilu: $DB_PROFILE i serwisów: ${SERVICES[*]:-(wszystkie)}"
+
+if [[ "$DB_PROFILE" == "pgsql" ]]; then
+  PROFILE_OPT="--profile pgsql"
+elif [[ "$DB_PROFILE" == "mysql" ]]; then
+  PROFILE_OPT="--profile mysql"
 else
-  docker compose -f "$COMPOSE_FILE" up -d --no-deps --build
+  PROFILE_OPT=""
+fi
+
+if [[ ${#SERVICES[@]} -gt 0 ]]; then
+  docker compose -f "$COMPOSE_FILE" up -d --no-deps --build $PROFILE_OPT "${SERVICES[@]}"
+else
+  docker compose -f "$COMPOSE_FILE" up -d --no-deps --build $PROFILE_OPT
 fi
 
 log "Gotowe ✅  (wersja: $(cat version.txt))"
diff --git a/docker-compose.yml b/docker-compose.yml
index 52e3be7..d7d5085 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -39,3 +39,28 @@ services:
     env_file:
       - .env
     restart: unless-stopped
+
+  pgsql:
+    image: postgres:17
+    container_name: pgsql-db
+    environment:
+      POSTGRES_DB: ${DB_NAME}
+      POSTGRES_USER: ${DB_USER}
+      POSTGRES_PASSWORD: ${DB_PASSWORD}
+    volumes:
+      - ./db/pgsql:/var/lib/postgresql/data
+    restart: unless-stopped
+    profiles: ["pgsql"]
+
+  mysql:
+    image: mysql:8
+    container_name: mysql-db
+    environment:
+      MYSQL_DATABASE: ${DB_NAME}
+      MYSQL_USER: ${DB_USER}
+      MYSQL_PASSWORD: ${DB_PASSWORD}
+      MYSQL_ROOT_PASSWORD: 89o38kUX5T4C
+    volumes:
+      - ./db/mysql:/var/lib/mysql
+    restart: unless-stopped
+    profiles: ["mysql"]
\ No newline at end of file