diff --git a/backend/package.json b/backend/package.json
index cba270ce..c2e3902f 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -5,6 +5,7 @@
   "main": "dist/index.js",
   "scripts": {
     "dev": "tsx watch src/index.ts",
+    "prebuild": "npm run prisma:generate",
     "build": "tsc",
     "start": "node dist/index.js",
     "test": "jest --runInBand",
diff --git a/backend/prisma/migrations/20260925010000_add_idempotency_key/migration.sql b/backend/prisma/migrations/20260925010000_add_idempotency_key/migration.sql
new file mode 100644
index 00000000..3eaf9ec6
--- /dev/null
+++ b/backend/prisma/migrations/20260925010000_add_idempotency_key/migration.sql
@@ -0,0 +1,23 @@
+-- CreateTable
+CREATE TABLE "IdempotencyKey" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "keyId" TEXT NOT NULL,
+    "tenantId" TEXT NOT NULL,
+    "walletAddress" TEXT,
+    "operation" TEXT NOT NULL,
+    "status" TEXT NOT NULL DEFAULT 'pending',
+    "requestHash" TEXT NOT NULL,
+    "responseHash" TEXT,
+    "responseBody" TEXT,
+    "statusCode" INTEGER,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "completedAt" DATETIME,
+    "expiresAt" DATETIME NOT NULL
+);
+
+-- CreateIndex
+CREATE INDEX "IdempotencyKey_expiresAt_idx" ON "IdempotencyKey"("expiresAt");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "IdempotencyKey_keyId_tenantId_key" ON "IdempotencyKey"("keyId", "tenantId");
+
diff --git a/backend/prisma/schema.prisma b/backend/prisma/schema.prisma
index 632280fb..13ba1fab 100644
--- a/backend/prisma/schema.prisma
+++ b/backend/prisma/schema.prisma
@@ -604,3 +604,22 @@ model WriteAheadAuditEntry {
   @@index([configType])
   @@index([actor])
 }
+
+model IdempotencyKey {
+  id            String    @id @default(uuid())
+  keyId         String
+  tenantId      String
+  walletAddress String?
+  operation     String
+  status        String    @default("pending") // pending | completed | failed
+  requestHash   String
+  responseHash  String?
+  responseBody  String?
+  statusCode    Int?
+  createdAt     DateTime  @default(now())
+  completedAt   DateTime?
+  expiresAt     DateTime
+
+  @@unique([keyId, tenantId])
+  @@index([expiresAt])
+}
diff --git a/backend/schema-snapshots/get-_health.json b/backend/schema-snapshots/get-_health.json
index 31d8f6b4..05101c57 100644
--- a/backend/schema-snapshots/get-_health.json
+++ b/backend/schema-snapshots/get-_health.json
@@ -81,6 +81,15 @@
             "degraded",
             "unknown"
           ]
+        },
+        "indexer": {
+          "type": "string",
+          "enum": [
+            "up",
+            "down",
+            "degraded",
+            "unknown"
+          ]
         }
       },
       "required": [
@@ -90,7 +99,8 @@
         "databasePrimary",
         "databaseReplica",
         "prisma",
-        "jobs"
+        "jobs",
+        "indexer"
       ],
       "additionalProperties": false
     },
diff --git a/backend/schema-snapshots/get-_ready.json b/backend/schema-snapshots/get-_ready.json
index 6e39ca57..cca01144 100644
--- a/backend/schema-snapshots/get-_ready.json
+++ b/backend/schema-snapshots/get-_ready.json
@@ -21,13 +21,17 @@
         },
         "prisma": {
           "type": "boolean"
+        },
+        "indexer": {
+          "type": "boolean"
         }
       },
       "required": [
         "cache",
         "stellarRpc",
         "database",
-        "prisma"
+        "prisma",
+        "indexer"
       ],
       "additionalProperties": false
     }