chore: make title modifiable, fix inital db value

server/db/database.ts

@@ -121,11 +121,10 @@ export const createUser: (db: DatabaseConnection, user: User) => Promise<void> =
 
 export const createProblem = (db: DatabaseConnection, { title, content, createdBy }: Omit<Problem, MetaProps>): Promise<ProblemId> =>
     withDatabase(db, state => {
-        const problemIds = Object.keys(state.problems)
-        const nextId = (problemIds.length > 0 ? String(parseInt(problemIds.at(-1)!) + 1) : '1') as ProblemId
+        const id = crypto.randomBytes(4).toString('hex') as ProblemId
 
-        state.problems[nextId] = {
-            id: nextId,
+        state.problems[id] = {
+            id,
             createdAt: new Date().toJSON(),
             deleted: false,
 
@@ -134,7 +133,7 @@ export const createProblem = (db: DatabaseConnection, { title, content, createdB
             createdBy,
         }
 
-        return nextId
+        return id
     })
 
 export const getProblem = (db: DatabaseConnection, id: string): Promise<Problem | null> =>