diff --git a/backend/app/models/notification.py b/backend/app/models/notification.py
new file mode 100644
index 0000000..0ba12c0
--- /dev/null
+++ b/backend/app/models/notification.py
@@ -0,0 +1,33 @@
+from datetime import datetime, timezone
+from decimal import Decimal
+from sqlalchemy import String, Boolean, DateTime, DECIMAL, Integer, Text, ForeignKey
+from sqlalchemy.orm import Mapped, mapped_column
+from app.core.database import Base
+
+
+class Notification(Base):
+    __tablename__ = "notifications"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    user_id: Mapped[int] = mapped_column(Integer, ForeignKey("users.id"), nullable=False)
+    title: Mapped[str] = mapped_column(String(200), nullable=False)
+    body: Mapped[str | None] = mapped_column(Text)
+    link: Mapped[str | None] = mapped_column(String(500))
+    is_read: Mapped[bool] = mapped_column(Boolean, default=False)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
+    )
+
+
+class AlertConfig(Base):
+    __tablename__ = "alert_config"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    key: Mapped[str] = mapped_column(String(100), unique=True, nullable=False)
+    value: Mapped[str] = mapped_column(String(255), nullable=False)
+    description: Mapped[str | None] = mapped_column(String(500))
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True),
+        default=lambda: datetime.now(timezone.utc),
+        onupdate=lambda: datetime.now(timezone.utc),
+    )
diff --git a/backend/app/services/storage.py b/backend/app/services/storage.py
new file mode 100644
index 0000000..f0d5a55
--- /dev/null
+++ b/backend/app/services/storage.py
@@ -0,0 +1,109 @@
+import io
+import uuid
+from datetime import timedelta
+from urllib.parse import urlparse
+
+import structlog
+from minio import Minio
+from minio.error import S3Error
+from fastapi import UploadFile, HTTPException, status
+
+from app.core.config import settings
+
+logger = structlog.get_logger()
+
+_client: Minio | None = None
+_public_client: Minio | None = None
+
+
+def get_client() -> Minio:
+    global _client
+    if _client is None:
+        _client = Minio(
+            settings.minio_endpoint,
+            access_key=settings.minio_access_key,
+            secret_key=settings.minio_secret_key,
+            secure=settings.minio_secure,
+        )
+    return _client
+
+
+def _get_public_client() -> Minio:
+    global _public_client
+    if _public_client is None:
+        parsed = urlparse(settings.minio_public_url)
+        endpoint = parsed.netloc
+        secure = parsed.scheme == "https"
+        _public_client = Minio(
+            endpoint,
+            access_key=settings.minio_access_key,
+            secret_key=settings.minio_secret_key,
+            secure=secure,
+            region="us-east-1",
+        )
+    return _public_client
+
+
+def _ensure_bucket(bucket: str) -> None:
+    client = get_client()
+    try:
+        if not client.bucket_exists(bucket):
+            client.make_bucket(bucket)
+            logger.info("minio_bucket_created", bucket=bucket)
+    except S3Error as exc:
+        logger.error("minio_bucket_error", bucket=bucket, error=str(exc))
+        raise
+
+
+async def upload_photo(file: UploadFile, valuation_id: int) -> str:
+    bucket = settings.minio_bucket_photos
+    try:
+        _ensure_bucket(bucket)
+    except S3Error as exc:
+        raise HTTPException(
+            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
+            detail="Storage non disponibile",
+        ) from exc
+
+    ext = ""
+    if file.filename and "." in file.filename:
+        ext = "." + file.filename.rsplit(".", 1)[-1].lower()
+
+    object_name = f"valuations/{valuation_id}/{uuid.uuid4().hex}{ext}"
+
+    content = await file.read()
+    content_length = len(content)
+    content_type = file.content_type or "application/octet-stream"
+
+    client = get_client()
+    try:
+        client.put_object(
+            bucket,
+            object_name,
+            io.BytesIO(content),
+            length=content_length,
+            content_type=content_type,
+        )
+        logger.info("minio_upload_ok", object_name=object_name)
+        return object_name
+    except S3Error as exc:
+        logger.error("minio_upload_error", object_name=object_name, error=str(exc))
+        raise HTTPException(
+            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
+            detail="Errore durante il caricamento del file",
+        ) from exc
+
+
+def get_presigned_url(storage_path: str, expires_hours: int = 4) -> str | None:
+    bucket = settings.minio_bucket_photos
+    client = _get_public_client()
+    try:
+        url = client.presigned_get_object(
+            bucket,
+            storage_path,
+            expires=timedelta(hours=expires_hours),
+        )
+        return url
+    except S3Error as exc:
+        logger.warning("minio_presigned_error", path=storage_path, error=str(exc))
+        return None