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app/infrastructure/cache/__init__.py

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+"""Redis adapter: shared connection pool for cache and arq broker."""
+
+from app.infrastructure.cache.redis import close_redis, get_redis
+
+__all__ = ["close_redis", "get_redis"]

app/infrastructure/cache/redis.py

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+"""Redis client provider — a single shared async connection pool."""
+
+from redis.asyncio import Redis
+
+from app.core.config import get_settings
+
+_client: Redis | None = None
+
+
+def get_redis() -> Redis:
+    """Return the process-wide Redis client (created on first use)."""
+    global _client
+    if _client is None:
+        _client = Redis.from_url(
+            str(get_settings().redis_url),
+            encoding="utf-8",
+            decode_responses=True,
+        )
+    return _client
+
+
+async def close_redis() -> None:
+    global _client
+    if _client is not None:
+        await _client.aclose()
+        _client = None