[MM-53291] Data retention improvements (#24253)

* adding new migration for RetentionIdsForDeletion, changing logic for deleting orphaned reactions. Updating delete user and channel endpoints to remove respective reactions

server/channels/db/migrations/migrations.list

@@ -222,6 +222,8 @@ channels/db/migrations/mysql/000111_update_vacuuming.down.sql
 channels/db/migrations/mysql/000111_update_vacuuming.up.sql
 channels/db/migrations/mysql/000112_rework_desktop_tokens.down.sql
 channels/db/migrations/mysql/000112_rework_desktop_tokens.up.sql
+channels/db/migrations/mysql/000113_create_retentionidsfordeletion_table.down.sql
+channels/db/migrations/mysql/000113_create_retentionidsfordeletion_table.up.sql
 channels/db/migrations/postgres/000001_create_teams.down.sql
 channels/db/migrations/postgres/000001_create_teams.up.sql
 channels/db/migrations/postgres/000002_create_team_members.down.sql
@@ -444,3 +446,5 @@ channels/db/migrations/postgres/000111_update_vacuuming.down.sql
 channels/db/migrations/postgres/000111_update_vacuuming.up.sql
 channels/db/migrations/postgres/000112_rework_desktop_tokens.down.sql
 channels/db/migrations/postgres/000112_rework_desktop_tokens.up.sql
+channels/db/migrations/postgres/000113_create_retentionidsfordeletion_table.down.sql
+channels/db/migrations/postgres/000113_create_retentionidsfordeletion_table.up.sql

server/channels/db/migrations/mysql/000113_create_retentionidsfordeletion_table.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS RetentionIdsForDeletion;

server/channels/db/migrations/mysql/000113_create_retentionidsfordeletion_table.up.sql

@@ -0,0 +1,7 @@
+CREATE TABLE IF NOT EXISTS RetentionIdsForDeletion (
+    Id varchar(26) NOT NULL,
+    TableName varchar(64),
+    Ids json,
+    PRIMARY KEY (Id),
+    KEY idx_retentionidsfordeletion_tablename (TableName)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

server/channels/db/migrations/postgres/000113_create_retentionidsfordeletion_table.down.sql

@@ -0,0 +1,3 @@
+DROP INDEX IF EXISTS idx_retentionidsfordeletion_tablename;
+
+DROP TABLE IF EXISTS retentionidsfordeletion;

server/channels/db/migrations/postgres/000113_create_retentionidsfordeletion_table.up.sql

@@ -0,0 +1,7 @@
+CREATE TABLE IF NOT EXISTS retentionidsfordeletion (
+    id varchar(26) PRIMARY KEY,
+    tablename varchar(64),
+    ids varchar(26)[]
+);
+
+CREATE INDEX IF NOT EXISTS idx_retentionidsfordeletion_tablename ON retentionidsfordeletion (tablename);