first commit

src/modules/likes/schemas/like.schema.ts

@@ -0,0 +1,19 @@
+import { Prop, Schema, SchemaFactory } from '@nestjs/mongoose';
+import { HydratedDocument, Types } from 'mongoose';
+
+export type LikeDocument = HydratedDocument<Like>;
+
+@Schema({ timestamps: true, versionKey: false })
+export class Like {
+  @Prop({ type: Types.ObjectId, required: true, index: true })
+  userId!: Types.ObjectId;
+
+  @Prop({ type: Types.ObjectId, required: true, index: true })
+  targetId!: Types.ObjectId;
+
+  @Prop({ required: true, enum: ['post', 'comment'] })
+  targetType!: 'post' | 'comment';
+}
+
+export const LikeSchema = SchemaFactory.createForClass(Like);
+LikeSchema.index({ userId: 1, targetId: 1, targetType: 1 }, { unique: true });