feat: enhance database management with new migration and database node functionalities, including CRUD operations and test cases

src/project/entities/project.entity.ts

@@ -3,11 +3,12 @@ import { Query } from "../../query/entities/query.entity";
 import {
   Column,
   Entity,
+  JoinColumn,
   OneToMany,
   OneToOne,
   PrimaryGeneratedColumn,
 } from "typeorm";
-import { Database } from "src/databaseManager/entities/database.entity";
+import { Database } from "../../databaseManager/entities/database.entity";
 
 @Entity("project")
 export class Project {
@@ -21,6 +22,7 @@ export class Project {
   apiTokens: Token[];
 
   @OneToOne(() => Database, (database) => database.project)
+  @JoinColumn()
   database: Database;
 
   @OneToMany(() => Query, (query) => query.project)