diff --git a/backend/services/mpc-service/prisma/migrations/20250102000000_init/migration.sql b/backend/services/mpc-service/prisma/migrations/20250102000000_init/migration.sql
index 92e4b146..4cf1aa36 100644
--- a/backend/services/mpc-service/prisma/migrations/20250102000000_init/migration.sql
+++ b/backend/services/mpc-service/prisma/migrations/20250102000000_init/migration.sql
@@ -17,35 +17,65 @@ CREATE TABLE "party_shares" (
 );
 
 -- CreateTable
-CREATE TABLE "signing_sessions" (
+CREATE TABLE "session_states" (
     "id" VARCHAR(255) NOT NULL,
-    "party_id" VARCHAR(255) NOT NULL,
     "session_id" VARCHAR(255) NOT NULL,
-    "message_hash" VARCHAR(255) NOT NULL,
-    "signature" TEXT,
-    "status" VARCHAR(20) NOT NULL DEFAULT 'pending',
+    "party_id" VARCHAR(255) NOT NULL,
+    "party_index" INTEGER NOT NULL,
+    "session_type" VARCHAR(20) NOT NULL,
+    "participants" TEXT NOT NULL,
+    "threshold_n" INTEGER NOT NULL,
+    "threshold_t" INTEGER NOT NULL,
+    "status" VARCHAR(20) NOT NULL,
+    "current_round" INTEGER NOT NULL DEFAULT 0,
     "error_message" TEXT,
-    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    "updated_at" TIMESTAMP(3) NOT NULL,
+    "public_key" TEXT,
+    "message_hash" VARCHAR(66),
+    "signature" TEXT,
+    "started_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
     "completed_at" TIMESTAMP(3),
 
-    CONSTRAINT "signing_sessions_pkey" PRIMARY KEY ("id")
+    CONSTRAINT "session_states_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "share_backups" (
+    "id" VARCHAR(255) NOT NULL,
+    "share_id" VARCHAR(255) NOT NULL,
+    "backup_data" TEXT NOT NULL,
+    "backup_type" VARCHAR(20) NOT NULL,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "created_by" VARCHAR(255),
+
+    CONSTRAINT "share_backups_pkey" PRIMARY KEY ("id")
 );
 
 -- CreateIndex
-CREATE INDEX "party_shares_party_id_idx" ON "party_shares"("party_id");
+CREATE UNIQUE INDEX "uk_party_session" ON "party_shares"("party_id", "session_id");
 
 -- CreateIndex
-CREATE INDEX "party_shares_session_id_idx" ON "party_shares"("session_id");
+CREATE INDEX "idx_ps_party_id" ON "party_shares"("party_id");
 
 -- CreateIndex
-CREATE INDEX "party_shares_status_idx" ON "party_shares"("status");
+CREATE INDEX "idx_ps_session_id" ON "party_shares"("session_id");
 
 -- CreateIndex
-CREATE INDEX "signing_sessions_party_id_idx" ON "signing_sessions"("party_id");
+CREATE INDEX "idx_ps_status" ON "party_shares"("status");
 
 -- CreateIndex
-CREATE INDEX "signing_sessions_session_id_idx" ON "signing_sessions"("session_id");
+CREATE UNIQUE INDEX "uk_session_party" ON "session_states"("session_id", "party_id");
 
 -- CreateIndex
-CREATE INDEX "signing_sessions_status_idx" ON "signing_sessions"("status");
+CREATE INDEX "idx_ss_session_id" ON "session_states"("session_id");
+
+-- CreateIndex
+CREATE INDEX "idx_ss_party_id" ON "session_states"("party_id");
+
+-- CreateIndex
+CREATE INDEX "idx_ss_status" ON "session_states"("status");
+
+-- CreateIndex
+CREATE INDEX "idx_share_id" ON "share_backups"("share_id");
+
+-- CreateIndex
+CREATE INDEX "idx_created_at" ON "share_backups"("created_at");