Prevent duplicate time entries and unify collaborator information

Adds a unique constraint to the database schema for time entries, preventing duplicates for the same month and collaborator. Also updates the API to check for existing entries before creation and unifies the collaborator name used in the dialog.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 55837015-10e9-4be9-b857-7f5e6be73772
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: 30c6f661-5ee7-47bf-80d3-9d74ec4d729b
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Replit-Helium-Checkpoint-Created: true

artifacts/api-server/src/routes/timesheets.ts

@@ -54,6 +54,20 @@ router.post("/timesheets", async (req, res): Promise<void> => {
     return;
   }
 
+  const [existing] = await db
+    .select()
+    .from(timesheetsTable)
+    .where(and(
+      eq(timesheetsTable.year, parsed.data.year),
+      eq(timesheetsTable.month, parsed.data.month),
+      eq(timesheetsTable.collaborator, parsed.data.collaborator)
+    ));
+
+  if (existing) {
+    res.status(409).json({ error: "Un CRA existe déjà pour ce mois et ce collaborateur" });
+    return;
+  }
+
   const [timesheet] = await db.insert(timesheetsTable).values(parsed.data).returning();
   res.status(201).json(GetTimesheetResponse.parse({ ...timesheet, lines: [] }));
 });

artifacts/cra-app/src/pages/timesheets.tsx

@@ -173,7 +173,7 @@ function CreateTimesheetDialog({ open, onOpenChange }: { open: boolean; onOpenCh
       data: {
         year: parseInt(year),
         month: parseInt(month),
-        collaborator: "Jean Dupont" // In a real app, from auth context
+        collaborator: "PHAM Sylvain"
       }
     }, {
       onSuccess: (data) => {

lib/db/src/schema/timesheets.ts

@@ -1,4 +1,4 @@
-import { pgTable, text, serial, timestamp, integer, real } from "drizzle-orm/pg-core";
+import { pgTable, text, serial, timestamp, integer, real, unique } from "drizzle-orm/pg-core";
 import { createInsertSchema } from "drizzle-zod";
 import { z } from "zod/v4";
 
@@ -11,7 +11,9 @@ export const timesheetsTable = pgTable("timesheets", {
   totalHours: real("total_hours").notNull().default(0),
   createdAt: timestamp("created_at", { withTimezone: true }).notNull().defaultNow(),
   updatedAt: timestamp("updated_at", { withTimezone: true }).notNull().defaultNow().$onUpdate(() => new Date()),
-});
+}, (table) => [
+  unique("timesheets_year_month_collaborator_unique").on(table.year, table.month, table.collaborator),
+]);
 
 export const insertTimesheetSchema = createInsertSchema(timesheetsTable).omit({ id: true, totalHours: true, createdAt: true, updatedAt: true });
 export type InsertTimesheet = z.infer<typeof insertTimesheetSchema>;