Add NEO4J_WORKSPACE env var override support

- Allow workspace override via NEO4J_WORKSPACE
- Update env.example with new config option

env.example

@@ -156,6 +156,7 @@ POSTGRES_MAX_CONNECTIONS=12
 NEO4J_URI=neo4j+s://xxxxxxxx.databases.neo4j.io
 NEO4J_USERNAME=neo4j
 NEO4J_PASSWORD='your_password'
+# NEO4J_WORKSPACE=forced_workspace_name
 
 ### MongoDB Configuration
 MONGO_URI=mongodb://root:root@localhost:27017/

lightrag/kg/neo4j_impl.py

@@ -51,6 +51,11 @@ logging.getLogger("neo4j").setLevel(logging.ERROR)
 @dataclass
 class Neo4JStorage(BaseGraphStorage):
     def __init__(self, namespace, global_config, embedding_func, workspace=None):
+        # Check NEO4J_WORKSPACE environment variable and override workspace if set
+        neo4j_workspace = os.environ.get("NEO4J_WORKSPACE")
+        if neo4j_workspace and neo4j_workspace.strip():
+            workspace = neo4j_workspace
+
         super().__init__(
             namespace=namespace,
             workspace=workspace or "",