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+---
+tags:
+  - taskflow
+references:
+  - https://docs.openstack.org/taskflow/latest/user/persistence.html
+---
+Main interface is called Backend.
+
+**prep**
+Backend + (Logbook ->) Flow Detail -> Engine -> Storage 
+
+**execution**
+inspect existing atom details -> find unfinished -> inspect graph -> run atoms
+
+**post exec**
+destroy logbook, clear backend
+can be configured to keep those things around for any purpose
+
+> Logbook is the authoritive source of run-time state. Logbook written first, then persisted.
+
+Namespace: `taskflow.persistence`.
+```
+from taskflow.persistence import backends
+
+...
+persistence = backends.fetch(conf={
+    "connection": "mysql",
+    "user": ...,
+    "password": ...,
+})
+
+logbookj
+```
+
+Types:
+- memory (connection: memoery)
+- files (connection: dir | file)
+	- https://docs.openstack.org/taskflow/latest/user/persistence.html#id5
+- sqlalchemy (connection: mysql | postgres | sqlite)
+- zookeper (connection: zookeeper)
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