Enhance schema for sellers, buyers, and admin analytics

src/models/Donation.js

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+const mongoose = require("mongoose");
+
+const DonationSchema = new mongoose.Schema(
+  {
+    donor_address: { type: String, required: true, lowercase: true },
+    project_id: {
+      type: mongoose.Schema.Types.ObjectId,
+      ref: "Project",
+      required: true,
+    },
+    amount: { type: Number, required: true },
+    transaction_hash: { type: String, required: true },
+    created_at: { type: Date, default: Date.now },
+  },
+  { timestamps: { createdAt: "created_at" } }
+);
+
+module.exports = mongoose.model("Donation", DonationSchema);

src/models/ImpactMetric.js

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+const mongoose = require("mongoose");
+
+const ImpactMetricSchema = new mongoose.Schema(
+  {
+    project_id: {
+      type: mongoose.Schema.Types.ObjectId,
+      ref: "Project",
+      required: true,
+    },
+    metric_type: { type: String, required: true }, // e.g., 'CO2_saved', 'trees_planted'
+    value: { type: Number, required: true },
+    recorded_at: { type: Date, default: Date.now },
+  },
+  { timestamps: false }
+);
+
+module.exports = mongoose.model("ImpactMetric", ImpactMetricSchema);

src/models/Project.js

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+const mongoose = require("mongoose");
+
+const ProjectSchema = new mongoose.Schema(
+  {
+    title: { type: String, required: true },
+    description: String,
+    category: String,
+    funding_goal: { type: Number, required: true },
+    current_funding: { type: Number, default: 0 },
+    impact_value: { type: Number, default: 0 },
+    image_url: String,
+    seller_address: { type: String, required: true, lowercase: true }, // wallet address of seller
+    organization_id: {
+      type: mongoose.Schema.Types.ObjectId,
+      ref: "Organization",
+    },
+    date_listed: { type: Date, default: Date.now },
+    created_at: { type: Date, default: Date.now },
+    updated_at: { type: Date, default: Date.now },
+  },
+  { timestamps: { createdAt: "created_at", updatedAt: "updated_at" } }
+);
+
+module.exports = mongoose.model("Project", ProjectSchema);

src/models/Purchase.js

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+const mongoose = require("mongoose");
+
+const PurchaseSchema = new mongoose.Schema(
+  {
+    buyer_address: { type: String, required: true, lowercase: true },
+    project_id: {
+      type: mongoose.Schema.Types.ObjectId,
+      ref: "Project",
+      required: true,
+    },
+    price: { type: Number, required: true },
+    status: {
+      type: String,
+      enum: ["pending", "completed", "cancelled"],
+      default: "pending",
+    },
+    transaction_hash: { type: String, required: true },
+    created_at: { type: Date, default: Date.now },
+    updated_at: { type: Date, default: Date.now },
+  },
+  { timestamps: { createdAt: "created_at", updatedAt: "updated_at" } }
+);
+
+module.exports = mongoose.model("Purchase", PurchaseSchema);

src/models/ResellListing.js

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+const mongoose = require("mongoose");
+
+const ResellListingSchema = new mongoose.Schema(
+  {
+    purchase_id: {
+      type: mongoose.Schema.Types.ObjectId,
+      ref: "Purchase",
+      required: true,
+    },
+    price: { type: Number, required: true },
+    status: {
+      type: String,
+      enum: ["listed", "sold", "cancelled"],
+      default: "listed",
+    },
+    transaction_hash: { type: String },
+    created_at: { type: Date, default: Date.now },
+    updated_at: { type: Date, default: Date.now },
+  },
+  { timestamps: { createdAt: "created_at", updatedAt: "updated_at" } }
+);
+
+module.exports = mongoose.model("ResellListing", ResellListingSchema);

src/models/Stake.js

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+const mongoose = require("mongoose");
+
+const StakeSchema = new mongoose.Schema(
+  {
+    purchase_id: {
+      type: mongoose.Schema.Types.ObjectId,
+      ref: "Purchase",
+      required: true,
+    },
+    voting_power: { type: Number, required: true },
+    apr: { type: Number, required: true },
+    lock_end_date: { type: Date, required: true },
+    status: {
+      type: String,
+      enum: ["locked", "unlocked", "withdrawn"],
+      default: "locked",
+    },
+    rewards_earned: { type: Number, default: 0 },
+    transaction_hash: { type: String },
+    created_at: { type: Date, default: Date.now },
+    updated_at: { type: Date, default: Date.now },
+  },
+  { timestamps: { createdAt: "created_at", updatedAt: "updated_at" } }
+);
+
+module.exports = mongoose.model("Stake", StakeSchema);