fix(server): update seeding script to drop table before insertion

Author: chenxin-yan

flake.nix

@@ -65,7 +65,7 @@
             gum style --margin "0 2" \
               "$(gum style --bold --foreground "#89b4fa" 'bun dev')         - Start development servers" \
               "$(gum style --bold --foreground "#89b4fa" 'bun dashboard')   - Open Convex dashboard" \
-              "$(gum style --bold --foreground "#89b4fa" 'bun check')       - Check code with Biome" \
+              "$(gum style --bold --foreground "#89b4fa" 'bun check')       - Check code with Biome" 
             echo ""
           '';
         };

packages/server/convex/seed.ts

@@ -10,6 +10,42 @@ import type { Id } from "./_generated/dataModel";
 import { internalMutation } from "./_generated/server";
 import { schoolName } from "./schemas/schools";
 
+/**
+ * Clear all data from all tables
+ * WARNING: This will delete all data in the database
+ */
+export const clearAll = internalMutation({
+  handler: async (ctx) => {
+    console.log("🗑️  Clearing all database tables...");
+
+    // Delete in reverse dependency order to maintain referential integrity
+    const tables = [
+      "userCourseOfferings",
+      "userCourses",
+      "students",
+      "courseOfferings",
+      "requirements",
+      "prerequisites",
+      "courses",
+      "programs",
+      "schools",
+      "appConfigs",
+    ] as const;
+
+    for (const tableName of tables) {
+      console.log(`  Clearing ${tableName}...`);
+      const documents = await ctx.db.query(tableName).collect();
+      for (const doc of documents) {
+        await ctx.db.delete(doc._id);
+      }
+      console.log(`  ✓ Cleared ${documents.length} records from ${tableName}`);
+    }
+
+    console.log("✅ All tables cleared successfully!");
+    return { success: true, message: "All tables cleared" };
+  },
+});
+
 /**
  * Seed all data from JSON files
  * This is the main seeding function that handles all tables with proper relationships

packages/server/seed/seed.ts

@@ -72,6 +72,25 @@ async function seedDatabase() {
     console.log(`  - ${userCourseOfferings.length} user course offerings`);
     console.log(`\n🔑 Using TEST_USER_ID: ${TEST_USER_ID}\n`);
 
+    // Step 1: Clear all existing data
+    console.log("🗑️  Clearing existing database...\n");
+    const clearCommand = "npx convex run seed:clearAll --no-push";
+
+    const { stdout: clearStdout, stderr: clearStderr } = await execAsync(
+      clearCommand,
+      {
+        cwd: new URL("..", import.meta.url).pathname,
+        maxBuffer: 10 * 1024 * 1024,
+      },
+    );
+
+    if (clearStderr) {
+      console.error("stderr:", clearStderr);
+    }
+
+    console.log(clearStdout);
+
+    // Step 2: Seed new data
     const data = JSON.stringify({
       appConfigs,
       schools,
@@ -85,7 +104,7 @@ async function seedDatabase() {
       userCourseOfferings,
     });
 
-    console.log("🚀 Calling Convex internal mutation via CLI...\n");
+    console.log("\n🚀 Seeding new data via Convex CLI...\n");
 
     const command = `npx convex run seed:seedAll --no-push '${data.replace(/'/g, "'\\''")}'`;