Fix #2000 (#2021)

* ChatId andSessionId returned back to varchar type.

* Will fix problems for the users whom already migrated to 1.6.2

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Co-authored-by: Emrah TOY <emrah.toy@mtekbilisim.com>

packages/server/src/database/entities/ChatMessage.ts

@@ -32,13 +32,13 @@ export class ChatMessage implements IChatMessage {
     @Column()
     chatType: string
 
-    @Column({ type: 'uuid' })
+    @Column({ type: 'varchar' })
     chatId: string
 
     @Column({ nullable: true })
     memoryType?: string
 
-    @Column({ type: 'uuid', nullable: true })
+    @Column({ type: 'varchar', nullable: true })
     sessionId?: string
 
     @Column({type:'timestamp'})