fix(plugin): hook cleanup + identity + compact-summary flow (#5076)

mem0-plugin/scripts/_identity.py

@@ -0,0 +1,59 @@
+"""Resolve mem0 user_id with deterministic priority.
+
+Resolution priority:
+  1. MEM0_USER_ID env var (explicit override)
+  2. ~/.mem0/identity.json cache (pinned to current MEM0_API_KEY fingerprint)
+  3. Derived: "mem0-" + sha256(MEM0_API_KEY)[:12]
+  4. Fallback: $USER, else "default"
+
+Same MEM0_API_KEY across machines yields the same user_id, which fixes
+the "47 user buckets per account" symptom from running on multiple
+laptops with different $USER values.
+"""
+
+from __future__ import annotations
+
+import hashlib
+import json
+import os
+from datetime import datetime, timezone
+
+_CACHE_PATH = os.path.expanduser("~/.mem0/identity.json")
+
+
+def resolve_user_id() -> str:
+    explicit = os.environ.get("MEM0_USER_ID", "").strip()
+    if explicit:
+        return explicit
+
+    api_key = os.environ.get("MEM0_API_KEY", "").strip()
+    if api_key:
+        digest = hashlib.sha256(api_key.encode("utf-8")).hexdigest()
+        fingerprint = digest[:8]
+
+        try:
+            with open(_CACHE_PATH, "r") as f:
+                cached = json.load(f)
+            if cached.get("api_key_fingerprint") == fingerprint and cached.get("user_id"):
+                return cached["user_id"]
+        except (OSError, json.JSONDecodeError):
+            pass
+
+        derived = "mem0-" + digest[:12]
+        try:
+            os.makedirs(os.path.dirname(_CACHE_PATH), exist_ok=True)
+            with open(_CACHE_PATH, "w") as f:
+                json.dump(
+                    {
+                        "user_id": derived,
+                        "source": "api_key",
+                        "api_key_fingerprint": fingerprint,
+                        "resolved_at": datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ"),
+                    },
+                    f,
+                )
+        except OSError:
+            pass
+        return derived
+
+    return os.environ.get("USER") or "default"