Separate into steps and wrap filesystem access

db.py

@@ -0,0 +1,28 @@
+
+from dataclasses import dataclass
+import os
+from pathlib import Path
+
+
+class DB:
+    def __init__(self, path):
+        self.path = Path(path).absolute()
+        os.makedirs(self.path, exist_ok=True)
+
+    def __getitem__(self, key):
+        with open(self.path / key) as f:
+            return f.read()
+
+    def __setitem__(self, key, val):
+        with open(self.path / key, 'w') as f:
+            f.write(val)
+
+
+# dataclass for all dbs:
+@dataclass
+class DBs:
+    memory: DB
+    logs: DB
+    identity: DB
+    input: DB
+    workspace: DB