fanavaran duplication request problems fixed.

src/fanavaran/schema/fanavaran-auth-token.schema.ts

@@ -0,0 +1,24 @@
+import { Prop, Schema, SchemaFactory } from "@nestjs/mongoose";
+import { HydratedDocument } from "mongoose";
+import type { FanavaranClientKey } from "src/core/config/fanavaran-client.config";
+
+/**
+ * Shared Fanavaran authenticationToken per tenant.
+ * Survives process restarts / multi-instance so we do not Login on every request.
+ */
+@Schema({ collection: "fanavaranAuthTokens", timestamps: true })
+export class FanavaranAuthToken {
+  @Prop({ type: String, required: true, unique: true, index: true })
+  clientKey: FanavaranClientKey;
+
+  @Prop({ type: String, required: true })
+  authenticationToken: string;
+
+  /** When this token should be refreshed (Asia/Tehran midnight). */
+  @Prop({ type: Date, required: true, index: true })
+  expiresAt: Date;
+}
+
+export type FanavaranAuthTokenDocument = HydratedDocument<FanavaranAuthToken>;
+export const FanavaranAuthTokenSchema =
+  SchemaFactory.createForClass(FanavaranAuthToken);