diff --git a/apps/api/src/auth/auth.service.spec.ts b/apps/api/src/auth/auth.service.spec.ts
index 16248d25..8d1a0c65 100644
--- a/apps/api/src/auth/auth.service.spec.ts
+++ b/apps/api/src/auth/auth.service.spec.ts
@@ -665,7 +665,7 @@ describe("AuthService.refresh", () => {
       }),
     );
     expect(jwtService.signAsync).toHaveBeenCalledWith(
-      expect.objectContaining({ sub: user.id }),
+      expect.objectContaining({ sub: user.id, sid: "rt-1" }),
       expect.objectContaining({
         algorithm: "HS256",
         issuer: "loomkeep-api",
diff --git a/apps/api/src/auth/auth.service.ts b/apps/api/src/auth/auth.service.ts
index ed6a1fdc..e15fdfd3 100644
--- a/apps/api/src/auth/auth.service.ts
+++ b/apps/api/src/auth/auth.service.ts
@@ -465,7 +465,7 @@ export class AuthService {
       );
     }
 
-    const signed = await this.signTokens(stored.user);
+    const signed = await this.signTokens(stored.user, stored.id);
     const rotated = await this.prisma.$transaction(async (tx) => {
       const update = await tx.refreshToken.updateMany({
         where: { id: stored.id, tokenHash },
@@ -680,13 +680,20 @@ export class AuthService {
   }
 
   /** Signs a fresh access/refresh pair. Persistence is the caller's job. */
-  private async signTokens(user: User): Promise<{
+  private async signTokens(
+    user: User,
+    sessionId: string,
+  ): Promise<{
     accessToken: string;
     refreshToken: string;
     jti: string;
     expiresAt: Date;
   }> {
-    const payload: JwtPayload = { sub: user.id, email: user.email };
+    const payload: JwtPayload = {
+      sub: user.id,
+      email: user.email,
+      sid: sessionId,
+    };
 
     const accessToken = await this.jwtService.signAsync(payload, {
       secret: this.configService.getOrThrow<string>("JWT_ACCESS_SECRET"),
@@ -776,12 +783,14 @@ export class AuthService {
     user: User,
     userAgent?: string,
   ): Promise<AuthTokensDto> {
-    const signed = await this.signTokens(user);
+    const sessionId = randomUUID();
+    const signed = await this.signTokens(user, sessionId);
     await this.prisma.refreshToken.deleteMany({
       where: { userId: user.id, userAgent: userAgent ?? null },
     });
     await this.prisma.refreshToken.create({
       data: {
+        id: sessionId,
         userId: user.id,
         tokenHash: hashToken(signed.refreshToken),
         jti: signed.jti,
diff --git a/apps/api/src/auth/decorators/current-user.decorator.ts b/apps/api/src/auth/decorators/current-user.decorator.ts
index a9806810..ca08fe60 100644
--- a/apps/api/src/auth/decorators/current-user.decorator.ts
+++ b/apps/api/src/auth/decorators/current-user.decorator.ts
@@ -5,6 +5,8 @@ export interface JwtPayload {
   /** User ID. */
   sub: string;
   email: string;
+  /** Stable server-side session ID. */
+  sid?: string;
 }
 
 export interface AuthenticatedRequest extends FastifyRequest {
diff --git a/apps/api/src/auth/mfa.service.spec.ts b/apps/api/src/auth/mfa.service.spec.ts
index 9aee0da0..9c91cf7d 100644
--- a/apps/api/src/auth/mfa.service.spec.ts
+++ b/apps/api/src/auth/mfa.service.spec.ts
@@ -141,15 +141,21 @@ describe("MfaService.confirmTotp / setEmailMfaEnabled — recovery code generati
       }),
     );
 
-    const first = await service.confirmTotp("user-1", code);
+    const first = await service.confirmTotp("user-1", code, "session-1");
     expect(first.recoveryCodes).toHaveLength(RECOVERY_CODE_COUNT);
     expect(prisma.refreshToken.deleteMany).toHaveBeenCalledWith({
-      where: { userId: "user-1" },
+      where: { userId: "user-1", id: { not: "session-1" } },
     });
 
-    const second = await service.setEmailMfaEnabled("user-1", true);
+    const second = await service.setEmailMfaEnabled(
+      "user-1",
+      true,
+      "session-1",
+    );
     expect(second.recoveryCodes).toBeUndefined();
-    expect(prisma.refreshToken.deleteMany).toHaveBeenCalledTimes(2);
+    expect(prisma.refreshToken.deleteMany).toHaveBeenLastCalledWith({
+      where: { userId: "user-1", id: { not: "session-1" } },
+    });
   });
 
   it("confirmTotp rejects an invalid code", async () => {
@@ -185,14 +191,14 @@ describe("MfaService.disableTotp", () => {
       makeUser({ passwordHash: await bcrypt.hash("correct", 4) }),
     );
 
-    await service.disableTotp("user-1", "correct");
+    await service.disableTotp("user-1", "correct", "session-1");
 
     expect(prisma.user.update).toHaveBeenCalledWith({
       where: { id: "user-1" },
       data: { mfaTotpEnabled: false, mfaTotpSecretEnc: null },
     });
     expect(prisma.refreshToken.deleteMany).toHaveBeenCalledWith({
-      where: { userId: "user-1" },
+      where: { userId: "user-1", id: { not: "session-1" } },
     });
   });
 });
diff --git a/apps/api/src/auth/mfa.service.ts b/apps/api/src/auth/mfa.service.ts
index beb5e81b..4aa9728b 100644
--- a/apps/api/src/auth/mfa.service.ts
+++ b/apps/api/src/auth/mfa.service.ts
@@ -73,6 +73,7 @@ export class MfaService {
   async confirmTotp(
     userId: string,
     code: string,
+    currentSessionId?: string,
   ): Promise<{ recoveryCodes?: string[] }> {
     const user = await this.prisma.user.findUniqueOrThrow({
       where: { id: userId },
@@ -97,14 +98,18 @@ export class MfaService {
         where: { id: userId },
         data: { mfaTotpEnabled: true },
       }),
-      this.prisma.refreshToken.deleteMany({ where: { userId } }),
+      this.deleteOtherSessionsQuery(userId, currentSessionId),
     ]);
 
     const recoveryCodes = await this.ensureRecoveryCodes(userId);
     return { recoveryCodes };
   }
 
-  async disableTotp(userId: string, currentPassword: string): Promise<void> {
+  async disableTotp(
+    userId: string,
+    currentPassword: string,
+    currentSessionId?: string,
+  ): Promise<void> {
     const user = await this.prisma.user.findUniqueOrThrow({
       where: { id: userId },
     });
@@ -121,20 +126,21 @@ export class MfaService {
         where: { id: userId },
         data: { mfaTotpEnabled: false, mfaTotpSecretEnc: null },
       }),
-      this.prisma.refreshToken.deleteMany({ where: { userId } }),
+      this.deleteOtherSessionsQuery(userId, currentSessionId),
     ]);
   }
 
   async setEmailMfaEnabled(
     userId: string,
     enabled: boolean,
+    currentSessionId?: string,
   ): Promise<{ recoveryCodes?: string[] }> {
     await this.prisma.$transaction([
       this.prisma.user.update({
         where: { id: userId },
         data: { mfaEmailEnabled: enabled },
       }),
-      this.prisma.refreshToken.deleteMany({ where: { userId } }),
+      this.deleteOtherSessionsQuery(userId, currentSessionId),
     ]);
 
     const recoveryCodes = enabled
@@ -163,10 +169,14 @@ export class MfaService {
   }
 
   /** Generates a fresh batch of 10, deleting any existing ones first. */
-  async regenerateRecoveryCodes(userId: string): Promise<string[]> {
+  async regenerateRecoveryCodes(
+    userId: string,
+    currentSessionId?: string,
+  ): Promise<string[]> {
     const codes = await this.generateRecoveryCodes(userId, {
       deleteExisting: true,
       revokeSessions: true,
+      currentSessionId,
     });
     return codes;
   }
@@ -182,6 +192,7 @@ export class MfaService {
     return this.generateRecoveryCodes(userId, {
       deleteExisting: false,
       revokeSessions: false,
+      currentSessionId: undefined,
     });
   }
 
@@ -190,7 +201,12 @@ export class MfaService {
     {
       deleteExisting,
       revokeSessions,
-    }: { deleteExisting: boolean; revokeSessions: boolean },
+      currentSessionId,
+    }: {
+      deleteExisting: boolean;
+      revokeSessions: boolean;
+      currentSessionId?: string;
+    },
   ): Promise<string[]> {
     const codes = Array.from({ length: RECOVERY_CODE_COUNT }, () =>
       generateRecoveryCode(),
@@ -207,13 +223,21 @@ export class MfaService {
         this.prisma.mfaRecoveryCode.create({ data: { userId, codeHash } }),
       ),
       ...(revokeSessions
-        ? [this.prisma.refreshToken.deleteMany({ where: { userId } })]
+        ? [this.deleteOtherSessionsQuery(userId, currentSessionId)]
         : []),
     ]);
 
     return codes;
   }
 
+  private deleteOtherSessionsQuery(userId: string, currentSessionId?: string) {
+    return this.prisma.refreshToken.deleteMany({
+      where: currentSessionId
+        ? { userId, id: { not: currentSessionId } }
+        : { userId },
+    });
+  }
+
   /** Normalizes (strips separators, uppercases), matches, and deletes the consumed row. */
   async verifyRecoveryCode(userId: string, rawCode: string): Promise<boolean> {
     const normalized = rawCode.replace(/[\s-]/g, "").toUpperCase();
diff --git a/apps/api/src/users/mfa.controller.ts b/apps/api/src/users/mfa.controller.ts
index b12f254c..e7ccf10a 100644
--- a/apps/api/src/users/mfa.controller.ts
+++ b/apps/api/src/users/mfa.controller.ts
@@ -43,7 +43,7 @@ export class MfaController {
     @CurrentUser() payload: JwtPayload,
     @Body() dto: ConfirmTotpDto,
   ): Promise<ConfirmTotpResponseDto> {
-    return this.mfaService.confirmTotp(payload.sub, dto.code);
+    return this.mfaService.confirmTotp(payload.sub, dto.code, payload.sid);
   }
 
   @Post("totp/disable")
@@ -51,7 +51,11 @@ export class MfaController {
     @CurrentUser() payload: JwtPayload,
     @Body() dto: DisableTotpDto,
   ): Promise<void> {
-    await this.mfaService.disableTotp(payload.sub, dto.currentPassword);
+    await this.mfaService.disableTotp(
+      payload.sub,
+      dto.currentPassword,
+      payload.sid,
+    );
   }
 
   @Patch("email")
@@ -60,7 +64,11 @@ export class MfaController {
     @CurrentUser() payload: JwtPayload,
     @Body() dto: SetEmailMfaDto,
   ): Promise<SetEmailMfaResponseDto> {
-    return this.mfaService.setEmailMfaEnabled(payload.sub, dto.enabled);
+    return this.mfaService.setEmailMfaEnabled(
+      payload.sub,
+      dto.enabled,
+      payload.sid,
+    );
   }
 
   // Authenticated-only, but still a sensitive/spammy-if-abused action.
@@ -71,7 +79,10 @@ export class MfaController {
     @CurrentUser() payload: JwtPayload,
   ): Promise<RegenerateRecoveryCodesResponseDto> {
     return {
-      codes: await this.mfaService.regenerateRecoveryCodes(payload.sub),
+      codes: await this.mfaService.regenerateRecoveryCodes(
+        payload.sub,
+        payload.sid,
+      ),
     };
   }
 }