diff --git a/prisma/migrations/20251009141338_change_type_mileage/migration.sql b/prisma/migrations/20251009141338_change_type_mileage/migration.sql
new file mode 100644
index 0000000..f43e8de
--- /dev/null
+++ b/prisma/migrations/20251009141338_change_type_mileage/migration.sql
@@ -0,0 +1,12 @@
+/*
+  Warnings:
+
+  - You are about to alter the column `mileage` on the `expenses` table. The data in that column could be lost. The data in that column will be cast from `Decimal(65,30)` to `Decimal(12,2)`.
+  - You are about to alter the column `mileage` on the `expenses_archive` table. The data in that column could be lost. The data in that column will be cast from `Decimal(65,30)` to `Decimal(12,2)`.
+
+*/
+-- AlterTable
+ALTER TABLE "expenses" ALTER COLUMN "mileage" SET DATA TYPE DECIMAL(12,2);
+
+-- AlterTable
+ALTER TABLE "expenses_archive" ALTER COLUMN "mileage" SET DATA TYPE DECIMAL(12,2);
diff --git a/prisma/mock-seeds-scripts/01-bankCodes.ts b/prisma/mock-seeds-scripts/01-bankCodes.ts
index 320db5d..2b1ade9 100644
--- a/prisma/mock-seeds-scripts/01-bankCodes.ts
+++ b/prisma/mock-seeds-scripts/01-bankCodes.ts
@@ -4,19 +4,19 @@ const prisma = new PrismaClient();
 
 async function main() {
   const presets = [
-    // type, categorie, modifier, bank_code
-    ['REGULAR'    ,'SHIFT'  , 1.0 , 'G1'  ],
-    ['OVERTIME'   ,'SHIFT'  , 2   , 'G43' ],
-    ['EMERGENCY'  ,'SHIFT'  , 2   , 'G48' ],
-    ['EVENING'    ,'SHIFT'  , 1.25, 'G56' ],
-    ['SICK'       ,'SHIFT'  , 1.0 , 'G105'],
-    ['PRIME_DISPO','EXPENSE', 1.0 , 'G202'],
-    ['COMMISSION' ,'EXPENSE', 1.0 , 'G234'],
-    ['VACATION'   ,'SHIFT'  , 1.0 , 'G305'],
-    ['PER_DIEM'   ,'EXPENSE', 1.0 , 'G502'],
-    ['MILEAGE'    ,'EXPENSE', 0.72, 'G503'],
-    ['EXPENSES'   ,'EXPENSE', 1.0 , 'G517'],
-    ['HOLIDAY'    ,'SHIFT'  , 2.0 , 'G700'],
+    // type,      categorie, modifier, bank_code
+    ['REGULAR'    ,'SHIFT'   , 1.0    , 'G1'  ],
+    ['OVERTIME'   ,'SHIFT'   , 2      , 'G43' ],
+    ['EMERGENCY'  ,'SHIFT'   , 2      , 'G48' ],
+    ['EVENING'    ,'SHIFT'   , 1.25   , 'G56' ],
+    ['SICK'       ,'SHIFT'   , 1.0    , 'G105'],
+    ['HOLIDAY'    ,'SHIFT'   , 1.0    , 'G104'],
+    ['VACATION'   ,'SHIFT'   , 1.0    , 'G305'],
+    ['ON_CALL'    ,'EXPENSE' , 1.0    , 'G202'],
+    ['COMMISSION' ,'EXPENSE' , 1.0    , 'G234'],
+    ['PER_DIEM'   ,'EXPENSE' , 1.0    , 'G502'],
+    ['MILEAGE'    ,'EXPENSE' , 0.72   , 'G503'],
+    ['EXPENSES'   ,'EXPENSE' , 1.0    , 'G517'],
   ];
 
   await prisma.bankCodes.createMany({
diff --git a/prisma/mock-seeds-scripts/12-expenses.ts b/prisma/mock-seeds-scripts/12-expenses.ts
index 622b30d..926a52f 100644
--- a/prisma/mock-seeds-scripts/12-expenses.ts
+++ b/prisma/mock-seeds-scripts/12-expenses.ts
@@ -43,6 +43,11 @@ function centsToAmountString(cents: number): string {
   return `${sign}${dollars}.${c.toString().padStart(2, '0')}`;
 }
 
+function to2(value: string): string {
+  // normalise au cas où (sécurité)
+  return (Math.round(parseFloat(value) * 100) / 100).toFixed(2);
+}
+
 // Tire un multiple de STEP_CENTS entre minCents et maxCents (inclus)
 function rndQuantizedCents(minCents: number, maxCents: number, step = STEP_CENTS): number {
   const qmin = Math.ceil(minCents / step);
@@ -118,20 +123,21 @@ async function main() {
         const bank_code_id = bcMap.get(code)!;
 
         // Montants (cents) quantisés à 25¢ => aucun flottant binaire plus tard
-        let amount: string;
+        let amount:  string = '0.00';
+        let mileage: string = '0.00';
         switch (code) {
           case 'G503': // kilométrage
-            amount = rndAmount(1000, 7500);       // 10.00 à 75.00
+            mileage = to2(rndAmount(1000, 7500));       // 10.00 à 75.00
             break;
           case 'G502': // per_diem
-            amount = rndAmount(1500, 3000);       // 15.00 à 30.00
+            amount = to2(rndAmount(1500, 3000));       // 15.00 à 30.00
             break;
-          case 'G202': // allowance /prime de garde
-            amount = rndAmount(2000, 15000);      // 20.00 à 150.00
+          case 'G202': // on_call /prime de garde
+            amount = to2(rndAmount(2000, 15000));      // 20.00 à 150.00
             break;
           case 'G517': // expenses
           default:
-            amount = rndAmount(500, 5000);        // 5.00 à 50.00
+            amount = to2(rndAmount(500, 5000));        // 5.00 à 50.00
             break;
         }
 
@@ -140,9 +146,10 @@ async function main() {
             timesheet_id: ts.id,
             bank_code_id,
             date,
-            amount, // string "xx.yy" (2 décimales exactes)
+            amount,
+            mileage,
             attachment: null,
-            comment: `Expense ${code} ${amount}$ (emp ${e.id})`,
+            comment: `Expense ${code} (emp ${e.id})`,
             is_approved: Math.random() < 0.65,
             supervisor_comment: Math.random() < 0.25 ? 'OK' : null,
           },
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index b223fa3..dd489c2 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -289,7 +289,7 @@ model Expenses {
 
   date               DateTime @db.Date
   amount             Decimal  @db.Money
-  mileage            Decimal?
+  mileage            Decimal? @db.Decimal(12,2)
   comment            String
   supervisor_comment String?
   is_approved        Boolean  @default(false)
@@ -311,7 +311,7 @@ model ExpensesArchive {
   bank_code_id       Int
   date               DateTime @db.Date
   amount             Decimal? @db.Money
-  mileage            Decimal?
+  mileage            Decimal? @db.Decimal(12,2)
   comment            String?
   is_approved        Boolean
   supervisor_comment String?
@@ -380,7 +380,7 @@ model Preferences {
   dark_mode     Boolean @default(false)
   lang_switch   Boolean @default(false)
   lefty_mode    Boolean @default(false)
-
+// TODO: change BOOLEAN to use 0 or 1 in case there is more than 2 options for each preferences
   @@map("preferences")
 }