fix(api): 23505 PG → 422 propre + schedulers Redis non-bloquants

- ExceptionHandler : convertit les violations de contrainte unique PG (23505) en réponse `{ errors: [{ code: 'duplicate', field, message }] }` 422 au lieu d'un 500 avec stack pg-protocol. Extrait le nom de colonne via regex sur le `detail` PG.
- InvoicesController.store + ImportBatchesController.validateDraft : wrap les appels schedulers (Redis side-effect, hors tx) dans try/catch + logger.warn. Si Redis flanche, l'invoice est créée et la requête HTTP retourne 201 normalement — l'utilisateur peut re-déclencher la programmation plus tard. Évite qu'une panne Redis casse le path de saisie.

apps/api/app/controllers/import_batches_controller.ts

@@ -18,6 +18,7 @@ import {
 import { recordActivity } from '#services/activity_recorder'
 import { scheduleRelancesForInvoice } from '#services/relance_scheduler'
 import { scheduleCheckinForInvoice } from '#services/checkin_scheduler'
+import logger from '@adonisjs/core/services/logger'
 import drive from '@adonisjs/drive/services/main'
 import { createReadStream } from 'node:fs'
 import { randomUUID } from 'node:crypto'
@@ -223,10 +224,14 @@ export default class ImportBatchesController {
     await invoice.load('client')
     await invoice.load('plan')
 
-    if (invoice.planId) {
-      await scheduleRelancesForInvoice(invoice)
+    try {
+      if (invoice.planId) {
+        await scheduleRelancesForInvoice(invoice)
+      }
+      await scheduleCheckinForInvoice(invoice)
+    } catch (err) {
+      logger.warn({ err, invoiceId: invoice.id }, 'failed to schedule relances/checkin')
     }
-    await scheduleCheckinForInvoice(invoice)
 
     return response.status(201).json({ data: new InvoiceTransformer(invoice).toObject() })
   }

apps/api/app/controllers/invoices_controller.ts

@@ -19,6 +19,7 @@ import {
   scheduleCheckinForInvoice,
   cancelCheckinForInvoice,
 } from '#services/checkin_scheduler'
+import logger from '@adonisjs/core/services/logger'
 
 const PAGE_SIZE = 50
 
@@ -305,12 +306,18 @@ export default class InvoicesController {
     await invoice.load('plan')
 
     // Programme les relances BullMQ si la facture a un plan + le check-in
-    // (envoyé pile à dueDate). Hors tx : les jobs sont posés dans Redis,
-    // on n'a pas besoin de cohérence DB.
-    if (invoice.planId) {
-      await scheduleRelancesForInvoice(invoice)
+    // (envoyé pile à dueDate). Hors tx — Redis ne participe pas aux
+    // garanties DB. On ne fait pas planter la requête HTTP si Redis est
+    // down : la facture est créée, l'utilisateur peut re-déclencher la
+    // programmation plus tard.
+    try {
+      if (invoice.planId) {
+        await scheduleRelancesForInvoice(invoice)
+      }
+      await scheduleCheckinForInvoice(invoice)
+    } catch (err) {
+      logger.warn({ err, invoiceId: invoice.id }, 'failed to schedule relances/checkin')
     }
-    await scheduleCheckinForInvoice(invoice)
 
     return response.status(201).json({ data: serializeInvoice(invoice) })
   }

apps/api/app/exceptions/handler.ts

@@ -1,27 +1,41 @@
 import app from '@adonisjs/core/services/app'
 import { type HttpContext, ExceptionHandler } from '@adonisjs/core/http'
 
+/**
+ * Exception handler API JSON-only. On normalise les erreurs DB / Vine
+ * en réponse `{ errors: [...] }` (cf. backend.md §6 pour le contrat).
+ */
 export default class HttpExceptionHandler extends ExceptionHandler {
-  /**
-   * In debug mode, the exception handler will display verbose errors
-   * with pretty printed stack traces.
-   */
   protected debug = !app.inProduction
 
-  /**
-   * The method is used for handling errors and returning
-   * response to the client
-   */
   async handle(error: unknown, ctx: HttpContext) {
+    // Postgres unique violation → 422 avec field/code stables, pas un
+    // 500 avec stack pg-protocol.
+    if (
+      error &&
+      typeof error === 'object' &&
+      'code' in error &&
+      (error as { code: unknown }).code === '23505'
+    ) {
+      const detail = String((error as { detail?: unknown }).detail ?? '')
+      // Tente d'extraire le nom de colonne du message PG ("Key (numero, ...)").
+      const fieldMatch = detail.match(/Key \(([^)]+)\)=/)
+      const field = fieldMatch?.[1]?.split(',')[0]?.trim()
+      ctx.response.status(422)
+      return ctx.response.json({
+        errors: [
+          {
+            code: 'duplicate',
+            message: 'Cette valeur existe déjà.',
+            field: field ?? undefined,
+          },
+        ],
+      })
+    }
+
     return super.handle(error, ctx)
   }
 
-  /**
-   * The method is used to report error to the logging service or
-   * the a third party error monitoring service.
-   *
-   * @note You should not attempt to send a response from this method.
-   */
   async report(error: unknown, ctx: HttpContext) {
     return super.report(error, ctx)
   }