Fix possible data corruption when using buffer_size option (#332)

* Fix test_codegen (finally!)

* Do not cache package_path

* Renamings

* Tests for realtime buffer

* Another codegen fix

* Rollback fixes

* More tests

* More

* Lint

* Useless log

* Do not ignore rollback for head index

* Drop messabes from buffer by channel;

* `on_index_rollback` hook

* Migration, cleanup

* Docs, cleanup

* Update exception, revert CLI checks

* Do not codegen on_rollback

* Add on_rollback to default hooks

* Set up dispatcher based on hooks presence

* Cleanup FIXMEs

* Single-level tests

* Init demos and tests

* config env -f

* Bump deps, lint

* Gotta go fast

Author: droserasprout

CHANGELOG.md

@@ -1,18 +1,24 @@
 # Changelog
 
-## [unreleased]
+## 5.1.0 - 2022-05-12
 
 ### Added
 
 * ci: Push `X` and `X.Y` tags to the Docker Hub on release.
 * cli: Added `config env` command to export env-file with default values.
 * cli: Show warning when running an outdated version of DipDup.
+* hooks: Added new hook `on_index_rollback` to perform per-index rollbacks.
 
 ### Fixed
 
 * index: Fixed fetching `migration` operations.
+* tzkt: Fixed possible data corruption when using `buffer_size` option.
 * tzkt: Fixed reconnection due to `websockets` message size limit.
 
+### Deprecated
+
+* hooks: The `on_rollback` default hook is superceeded by `on_index_rollback` and weill be removed later.
+
 ## 5.0.4 - 2022-05-05
 
 ### Fixed