Terms of Service

1. Agreement to Terms

By accessing or using DB Exercises (accessible at dbexcercises.vercel.app), you agree to be bound by these Terms of Service ("Terms") and our Privacy Policy. If you do not agree with any part of these Terms, you may not access or use the platform.

2. Description of Service

DB Exercises is an interactive educational platform designed for practicing PostgreSQL and business analytics queries directly in your browser using WebAssembly. We provide free starter challenges, curriculum tracks, cheat sheets, interview questions, and a paid Pro membership with full catalog access and advanced diagnostics.

3. Accounts & Access Tiers

• Starter Tier: Access to 18 foundational SQL exercises across fundamental syntax, basic aggregations, and standard joins at no cost.
• Pro Membership: Access to all 100 business analytics exercises, advanced Window Functions, Common Table Expressions (CTEs), complete interview questions, and AI diagnostics.
• Device Responsibility: Progress is maintained via browser storage. You are responsible for maintaining your device and browser data.

4. Subscriptions, Billing & Merchant of Record

All paid transactions for DB Exercises are processed by our authorized Merchant of Record partner, Dodo Payments.

• Merchant of Record Role: Dodo Payments is the legal seller of the software membership. Dodo handles payment authorization, invoicing, sales taxes, and VAT compliance worldwide.
• Recurring Subscriptions: Monthly ($5.99) and Annual ($49) plans automatically renew at the conclusion of each billing cycle unless cancelled prior to the renewal date.
• Lifetime Access: Lifetime plans ($69) provide perpetual access to all current and future exercises with a single, one-time payment.
• Cancellation: You may cancel your subscription at any time via the self-service Dodo Payments Customer Portal. Cancellation stops future recurring charges while retaining Pro access through the end of the active paid period.

5. Intellectual Property Rights

The software, exercise curriculums, database seed schemas, test suites, grading algorithms, visual layout, and branding are the exclusive property of DB Exercises Platform Inc. and its licensors. You are granted a limited, personal, non-exclusive license to use the platform for educational purposes. You may not scrape, reproduce, redistribute, or resell our curriculum or exercise test suites without prior written consent.

6. Acceptable Use

You agree not to:

• Attempt to reverse-engineer, exploit, or bypass platform access controls or client-side license checks.
• Use automated scrapers, bots, or extraction scripts against the exercise catalog.
• Abuse, overload, or disrupt the AI hint generation endpoints.
• Share direct checkout bypasses or fraudulent payment receipts.

7. Disclaimer of Warranties

DB Exercises is provided on an "AS IS" and "AS AVAILABLE" basis. While we strive for 100% accuracy in our PostgreSQL execution sandbox, we make no guarantees that all exercises or database edge cases are error-free or uninterrupted. Exercise schemas are synthetic and designed solely for training and instructional simulations.

8. Limitation of Liability

To the maximum extent permitted by law, DB Exercises Platform Inc. and Dodo Payments shall not be liable for any indirect, incidental, or consequential damages resulting from your use of or inability to use the platform. Our total liability for any claim shall not exceed the amount paid by you in the preceding twelve months.