Add temporary sanchonet changelog

Author: kderme

cardano-db-sync/CHANGELOG.md

@@ -1,6 +1,58 @@
 # Revision history for cardano-db-sync
 
-## 13.2.0.0
+## Sancho changelog
+`sancho-a-b-c` tags in db-sync are a series of incremental integration of conway feautures. These tags can follow the
+sanchonet https://book.world.dev.cardano.org/environments.html#sanchonet-testnet.
+Their enumeration has the following meaning:<br>
+a: schema changes<br>
+b: compatible with a respinned sanchonet or node<br>
+c: minor changes or fixes<br>
+
+It is advised to resync from genesis when using a new version a or b.
+
+Some useful links (adjust the numbers to the correct tag):
+
+- Changelog: https://github.com/input-output-hk/cardano-db-sync/blob/sancho-2-0-0/cardano-db-sync/CHANGELOG.md#13200
+- Schema docs https://github.com/input-output-hk/cardano-db-sync/blob/sancho-2-0-0/doc/schema.md
+- Postgres migrations https://github.com/input-output-hk/cardano-db-sync/tree/sancho-2-0-0/schema
+
+In the schema docs, you can search for `13.2` or `Conway` for schema changes from the previous official release.
+
+### sancho-2.2.0
+- is compatible with node 8.6-pre
+- `governance_action.ratified_epoch` is now populated
+- `drep_distr.active_until` is now populated
+- Fixed typo `voting_procedure.comittee_voter` to `voting_procedure.committee_voter`
+- Added `committee_de_registration.voting_anchor_id` field
+
+### sancho-2.1.0
+- Fixed an issue with the size of Committee hash
+
+### sancho-2.0.1
+- Workaround an issue where delegation could target unregistered pools
+
+### sancho-2.0.0
+- is compatible with node 8.5-pre
+- adds the governance epoch param group in table `epoch_param` and their updates through governance proposal in
+`param_proposal`
+- adds a new field `governance_action.expiration` for the expected expiration of an action.
+- populates the `drep_distr` table and `governance.enacted_epoch` that used to remain empty.
+- fixes an issue with duplicated entries in `drep_hash` and `voting_anchor`.
+- merges drep registration, re-registration and de-registration on the same table `drep_registration` for easy use
+- the new field `drep_distr.active_until` is not populated yet.
+- change `new_committee` gov actions represantation.
+
+### sancho-1.1.0
+- is compatible with node-8.3-pre. There are no schema changes over sancho-1-0-0.
+
+### sancho-1.0.0
+The schema is quite close to the [initial design](https://github.com/input-output-hk/cardano-db-sync/blob/conway-schema-design-13.2/doc/schema.md). You may find some differences: ie the `param_proposals` and `epoch_param` are not extended yet,
+Some tables/fields are created but are not populated yet: `anchor_offline_data`, `anchor_offline_fetch_error` , `drep_distr` , `governance_action.x_epoch` , `delegation_vote.redeemer_id`
+
+### sancho-0.0.0
+It's very early stage and is missing all Conway specific feautures and some Shelley features related to Rewards. Incremental tags will follow.
+
+## 13.2.0.0 - Unreleased
 * Uses the cache for the computation of `epoch` table when following
 * `epoch_stake` is now computed earlier, before the epoch is reached
 * Exception handling and concurrency improved.