init: documentation and prototypes

prototype-grok4.1/direktvermittlungde-backend/services.py

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+import asyncio
+import base64
+import uuid
+from concurrent.futures import ProcessPoolExecutor
+from datetime import datetime, timedelta
+from typing import Dict
+
+import aioboto3
+from arq.connections import RedisSettings
+from fastapi import HTTPException, status, Query, Depends
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from .models import Metadata, Document, Thread, Message
+
+# Global executor for CPU tasks
+cpu_pool = ProcessPoolExecutor(max_workers=4)
+
+# Redis
+redis_settings = RedisSettings.from_dsn("redis://localhost")
+
+# S3
+async def get_s3_client():
+    return aioboto3.Session().client(
+        's3',
+        endpoint_url='http://localhost:9000',  # From env
+        aws_access_key_id='minioadmin',
+        aws_secret_access_key='minioadmin'
+    )
+
+# Routing Engine
+def route_document(metadata: Metadata) -> str:
+    rules = {
+        "Finanzamt-München-I": "Steuerfestsetzung-Team-B",
+        "Gericht-Berlin": "Zivilabteilung"
+    }
+    return rules.get(metadata.authority_id, "Fallback-Team")
+
+# Rate Limiting
+async def rate_limit(user_id: str, redis, limit: int = 10, window: int = 60):
+    key = f"rate_limit:{user_id}"
+    current = await redis.get(key)
+    if current is None:
+        await redis.setex(key, window, 1)
+        return True
+    count = int(current)
+    if count >= limit:
+        raise HTTPException(status_code=429, detail="Rate limit exceeded")
+    await redis.incr(key)
+    return True
+
+# Validate Encrypted Payload (CPU-bound)
+def validate_encrypted_payload(payload_b64: str) -> bool:
+    payload_bytes = base64.b64decode(payload_b64)
+    return payload_bytes.startswith(b'\x00\x01')  # Demo check
+
+# GDPR Reaper
+async def reaper(db: AsyncSession):
+    stmt = delete(Document).where(Document.retention_date < datetime.now())
+    await db.execute(stmt)
+    await db.commit()