diff --git a/backend/prisma/migrations/20260925000000_add_vault_allocation_tenant_fields/migration.sql b/backend/prisma/migrations/20260925000000_add_vault_allocation_tenant_fields/migration.sql
new file mode 100644
index 000000000..4cad9f7d1
--- /dev/null
+++ b/backend/prisma/migrations/20260925000000_add_vault_allocation_tenant_fields/migration.sql
@@ -0,0 +1,86 @@
+-- AlterTable
+ALTER TABLE "Transaction" ADD COLUMN "failureReason" TEXT;
+ALTER TABLE "Transaction" ADD COLUMN "latencyMs" INTEGER;
+ALTER TABLE "Transaction" ADD COLUMN "tenantId" TEXT;
+ALTER TABLE "Transaction" ADD COLUMN "vaultId" TEXT;
+
+-- CreateTable
+CREATE TABLE "Vault" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "tenantId" TEXT NOT NULL,
+    "aum" REAL NOT NULL DEFAULT 0,
+    "tvlUsd" TEXT,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL,
+    "deletedAt" DATETIME
+);
+
+-- CreateTable
+CREATE TABLE "Strategy" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "name" TEXT NOT NULL,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL
+);
+
+-- CreateTable
+CREATE TABLE "Allocation" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "vaultId" TEXT NOT NULL,
+    "strategyId" TEXT NOT NULL,
+    "amount" REAL NOT NULL DEFAULT 0,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL,
+    CONSTRAINT "Allocation_vaultId_fkey" FOREIGN KEY ("vaultId") REFERENCES "Vault" ("id") ON DELETE CASCADE ON UPDATE CASCADE,
+    CONSTRAINT "Allocation_strategyId_fkey" FOREIGN KEY ("strategyId") REFERENCES "Strategy" ("id") ON DELETE CASCADE ON UPDATE CASCADE
+);
+
+-- CreateTable
+CREATE TABLE "ExposureBreach" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "vaultId" TEXT NOT NULL,
+    "strategyId" TEXT NOT NULL,
+    "attemptedAmount" TEXT NOT NULL,
+    "reason" TEXT NOT NULL,
+    "timestamp" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+-- CreateTable
+CREATE TABLE "WalletTenantAssociation" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "walletAddress" TEXT NOT NULL,
+    "tenantId" TEXT NOT NULL,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "deletedAt" DATETIME
+);
+
+-- CreateIndex
+CREATE INDEX "Vault_tenantId_idx" ON "Vault"("tenantId");
+
+-- CreateIndex
+CREATE INDEX "Vault_deletedAt_idx" ON "Vault"("deletedAt");
+
+-- CreateIndex
+CREATE INDEX "Allocation_vaultId_idx" ON "Allocation"("vaultId");
+
+-- CreateIndex
+CREATE INDEX "Allocation_strategyId_idx" ON "Allocation"("strategyId");
+
+-- CreateIndex
+CREATE INDEX "ExposureBreach_vaultId_idx" ON "ExposureBreach"("vaultId");
+
+-- CreateIndex
+CREATE INDEX "ExposureBreach_strategyId_idx" ON "ExposureBreach"("strategyId");
+
+-- CreateIndex
+CREATE INDEX "ExposureBreach_timestamp_idx" ON "ExposureBreach"("timestamp");
+
+-- CreateIndex
+CREATE INDEX "WalletTenantAssociation_walletAddress_tenantId_idx" ON "WalletTenantAssociation"("walletAddress", "tenantId");
+
+-- CreateIndex
+CREATE INDEX "WalletTenantAssociation_tenantId_idx" ON "WalletTenantAssociation"("tenantId");
+
+-- CreateIndex
+CREATE INDEX "Transaction_vaultId_tenantId_timestamp_idx" ON "Transaction"("vaultId", "tenantId", "timestamp" DESC);
+
diff --git a/backend/prisma/schema.prisma b/backend/prisma/schema.prisma
index 13ba1fab8..20e8c2e41 100644
--- a/backend/prisma/schema.prisma
+++ b/backend/prisma/schema.prisma
@@ -40,13 +40,17 @@ model SharePriceSnapshot {
 }
 
 model Transaction {
-  id           String   @id @default(uuid())
-  user         String
-  amount       String
-  type         String
-  status       String?
-  referralCode String?
-  timestamp    DateTime @default(now())
+  id            String   @id @default(uuid())
+  user          String
+  amount        String
+  type          String
+  status        String?
+  referralCode  String?
+  vaultId       String?
+  tenantId      String?
+  latencyMs     Int?
+  failureReason String?
+  timestamp     DateTime @default(now())
 
   // Issue #895 – query optimisation indices
   // Ordered by timestamp DESC to match the default sort on the list endpoint.
@@ -56,6 +60,7 @@ model Transaction {
   @@index([status, timestamp(sort: Desc)])
   @@index([user, type, timestamp(sort: Desc)])
   @@index([user, status, timestamp(sort: Desc)])
+  @@index([vaultId, tenantId, timestamp(sort: Desc)])
 }
 
 model Referral {
@@ -605,6 +610,71 @@ model WriteAheadAuditEntry {
   @@index([actor])
 }
 
+// ─── Vault Strategy Allocation & Exposure Guardrails ─────────────────────────
+
+model Vault {
+  id        String    @id @default(uuid())
+  tenantId  String
+  aum       Float     @default(0)
+  tvlUsd    String?
+  createdAt DateTime  @default(now())
+  updatedAt DateTime  @updatedAt
+  deletedAt DateTime?
+
+  allocations Allocation[]
+
+  @@index([tenantId])
+  @@index([deletedAt])
+}
+
+model Strategy {
+  id        String   @id @default(uuid())
+  name      String
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  allocations Allocation[]
+}
+
+model Allocation {
+  id         String   @id @default(uuid())
+  vaultId    String
+  strategyId String
+  amount     Float    @default(0)
+  createdAt  DateTime @default(now())
+  updatedAt  DateTime @updatedAt
+
+  vault    Vault    @relation(fields: [vaultId], references: [id], onDelete: Cascade)
+  strategy Strategy @relation(fields: [strategyId], references: [id], onDelete: Cascade)
+
+  @@index([vaultId])
+  @@index([strategyId])
+}
+
+model ExposureBreach {
+  id              String   @id @default(uuid())
+  vaultId         String
+  strategyId      String
+  attemptedAmount String
+  reason          String
+  timestamp       DateTime @default(now())
+
+  @@index([vaultId])
+  @@index([strategyId])
+  @@index([timestamp])
+}
+
+// ─── Tenant Boundary ─────────────────────────────────────────────────────────
+
+model WalletTenantAssociation {
+  id            String    @id @default(uuid())
+  walletAddress String
+  tenantId      String
+  createdAt     DateTime  @default(now())
+  deletedAt     DateTime?
+
+  @@index([walletAddress, tenantId])
+  @@index([tenantId])
 model IdempotencyKey {
   id            String    @id @default(uuid())
   keyId         String