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backend/src/schemas/GridCell.js

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+const mongoose = require("mongoose");
+
+const gridCellSchema = new mongoose.Schema(
+  {
+    x: { type: Number, required: true, min: 1, max: 90 },
+    y: { type: Number, required: true, min: 1, max: 90},
+    color: { type: Number, required: true },
+  },
+  { timestamps: true }
+);
+
+gridCellSchema.index({ x: 1, y: 1 }, { unique: true });
+
+gridCellSchema.methods.toDisplayColor = function () {
+  if (this.color.startsWith("#")) return this.color;
+  return `#${this.color}`;
+};
+
+const GridCell = mongoose.model("GridCell", gridCellSchema);
+
+module.exports = GridCell;