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Changelog entries for 12.1.0 (#7194) 

Co-authored-by: naisila <nicypp@gmail.com>
Co-authored-by: Onur Tirtir <onurcantirtir@gmail.com>
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### citus v12.1.0 (September 12, 2023) ###
* Adds support for PostgreSQL 16.0 (#7173)
* Add `citus_schema_move()` function which moves tables within a
distributed schema to another node (#7180)
* Adds `citus_pause_node()` UDF that allows pausing the node with given id
(#7089)
* Makes sure to enforce shard level colocation with the GUC
`citus.enable_non_colocated_router_query_pushdown` (#7076)
* Allows creating reference / distributed-schema tables from local tables added
to metadata and that use identity columns (#7131)
* Propagates `BUFFER_USAGE_LIMIT` option in `VACUUM` and `ANALYZE` (#7114)
* Propagates `PROCESS_MAIN`, `SKIP_DATABASE_STATS`, `ONLY_DATABASE_STATS`
options in `VACUUM` (#7114)
* Propagates `GENERIC_PLAN` option in `EXPLAIN` (#7141)
* Propagates "rules" option in `CREATE COLLATION` (#7185)
* Propagates `GRANT`/ `REVOKE` for database privileges (#7109)
* Adds TRUNCATE trigger support on Citus foreign tables (#7170)
* Removes `pg_send_cancellation` (#7135)
* Prevents unnecessarily pulling the data into coordinator for some
`INSERT .. SELECT` queries that target a single-shard group (#7077)
* Makes sure that rebalancer throws an error if replication factor is greater
than the shard allowed node count. Also makes sure to avoid moving a shard
to a node that it already exists on. (#7074)
* Fixes a bug that may appear during 2PC recovery when there are multiple
databases (#7174)
* Fixes a bug that could cause `COPY` logic to skip data in case of
out-of-memory (#7152)
* Fixes a bug that causes an unexpected error when adding a column with
a `NULL` constraint (#7093)
* Fixes `PROCESS_TOAST` default value to `true` (#7122)
* Improves the error thrown when there is datatype mismatch in `MERGE ON`
(#7081)
### citus v12.0.0 (July 11, 2023) ###
* Adds support for schema-based sharding.