feat: Implement file upload and management system with database integration

src/app/api/files/[fileId]/route.js

@@ -0,0 +1,79 @@
+import { NextResponse } from "next/server";
+import { unlink } from "fs/promises";
+import path from "path";
+import db from "@/lib/db";
+
+export async function DELETE(request, { params }) {
+	try {
+		const fileId = params.fileId;
+
+		// Get file info from database
+		const file = db.prepare(`
+			SELECT * FROM file_attachments WHERE file_id = ?
+		`).get(parseInt(fileId));
+
+		if (!file) {
+			return NextResponse.json(
+				{ error: "File not found" },
+				{ status: 404 }
+			);
+		}
+
+		// Delete physical file
+		try {
+			const fullPath = path.join(process.cwd(), "public", file.file_path);
+			await unlink(fullPath);
+		} catch (fileError) {
+			console.warn("Could not delete physical file:", fileError.message);
+			// Continue with database deletion even if file doesn't exist
+		}
+
+		// Delete from database
+		const result = db.prepare(`
+			DELETE FROM file_attachments WHERE file_id = ?
+		`).run(parseInt(fileId));
+
+		if (result.changes === 0) {
+			return NextResponse.json(
+				{ error: "File not found" },
+				{ status: 404 }
+			);
+		}
+
+		return NextResponse.json({ success: true });
+
+	} catch (error) {
+		console.error("Error deleting file:", error);
+		return NextResponse.json(
+			{ error: "Failed to delete file" },
+			{ status: 500 }
+		);
+	}
+}
+
+export async function GET(request, { params }) {
+	try {
+		const fileId = params.fileId;
+
+		// Get file info from database
+		const file = db.prepare(`
+			SELECT * FROM file_attachments WHERE file_id = ?
+		`).get(parseInt(fileId));
+
+		if (!file) {
+			return NextResponse.json(
+				{ error: "File not found" },
+				{ status: 404 }
+			);
+		}
+
+		return NextResponse.json(file);
+
+	} catch (error) {
+		console.error("Error fetching file:", error);
+		return NextResponse.json(
+			{ error: "Failed to fetch file" },
+			{ status: 500 }
+		);
+	}
+}