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src/server/models/StockItem.ts

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+import mongoose, { Schema, Document } from 'mongoose';
+
+export interface IStockItem extends Document {
+    organizationId?: string;
+    createdBy?: string;
+    dataSheetId: mongoose.Types.ObjectId;
+    rrNumber: string; // Registro de Rastreabilidade
+    batchNumber: string; // Lote
+    color?: string;
+    invoiceNumber?: string; // Nota Fiscal
+    receivedBy?: string; // Quem recebeu
+    quantity: number;
+    unit: string;
+    minStock?: number; // Estoque mínimo estipulado
+    expirationDate?: Date;
+    entryDate: Date;
+    notes?: string;
+    createdAt: Date;
+    updatedAt: Date;
+}
+
+const StockItemSchema: Schema = new Schema({
+    organizationId: { type: String, index: true },
+    createdBy: { type: String, index: true },
+    dataSheetId: { type: Schema.Types.ObjectId, ref: 'TechnicalDataSheet', required: true },
+    rrNumber: { type: String, required: true },
+    batchNumber: { type: String, required: true },
+    color: { type: String },
+    invoiceNumber: { type: String },
+    receivedBy: { type: String },
+    quantity: { type: Number, required: true, default: 0 },
+    unit: { type: String, required: true },
+    minStock: { type: Number, default: 0 },
+    expirationDate: { type: Date },
+    entryDate: { type: Date, default: Date.now },
+    notes: { type: String }
+}, { timestamps: true });
+
+// Compound index to prevent duplicate RR within an organization, if desirable.
+// For now, indexing RR for fast lookup.
+StockItemSchema.index({ organizationId: 1, rrNumber: 1 });
+
+export default mongoose.models.StockItem || mongoose.model<IStockItem>('StockItem', StockItemSchema);