Complete backend infrastructure and authentication system

Co-authored-by: mblanke <9078342+mblanke@users.noreply.github.com>

backend/app/api/routes/ingestion.py

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+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+from pydantic import BaseModel
+from typing import Optional, Dict, Any
+
+from app.core.database import get_db
+from app.core.deps import get_current_active_user, get_tenant_id
+from app.models.user import User
+from app.models.host import Host
+
+router = APIRouter()
+
+
+class IngestionData(BaseModel):
+    hostname: str
+    data: Dict[str, Any]
+
+
+class IngestionResponse(BaseModel):
+    message: str
+    host_id: int
+
+
+@router.post("/ingest", response_model=IngestionResponse)
+async def ingest_data(
+    ingestion: IngestionData,
+    current_user: User = Depends(get_current_active_user),
+    tenant_id: int = Depends(get_tenant_id),
+    db: Session = Depends(get_db)
+):
+    """
+    Ingest data from Velociraptor
+    
+    Creates or updates host information scoped to the user's tenant.
+    """
+    # Find or create host
+    host = db.query(Host).filter(
+        Host.hostname == ingestion.hostname,
+        Host.tenant_id == tenant_id
+    ).first()
+    
+    if host:
+        # Update existing host
+        host.host_metadata = ingestion.data
+    else:
+        # Create new host
+        host = Host(
+            hostname=ingestion.hostname,
+            tenant_id=tenant_id,
+            host_metadata=ingestion.data
+        )
+        db.add(host)
+    
+    db.commit()
+    db.refresh(host)
+    
+    return {
+        "message": "Data ingested successfully",
+        "host_id": host.id
+    }