Feature/query functions

DEPLOYMENT_CHECKLIST.md

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+# Query Functions - Deployment Checklist
+
+## Pre-Deployment Verification
+
+### Code Quality ✓
+
+- [x] **Syntax Validation**
+  - queries.rs: No errors found ✓
+  - query_tests.rs: No errors found ✓
+  - lib.rs: Module integration verified ✓
+
+- [x] **Error Handling**
+  - All error paths covered
+  - Proper error types returned
+  - Graceful degradation implemented
+
+- [x] **Security**
+  - Input validation on all parameters
+  - No SQL injection vectors (N/A - not using DB)
+  - No reentrancy issues (read-only functions)
+  - Proper access control
+
+### Testing ✓
+
+- [x] **Test Coverage (20+ tests)**
+  - Unit tests: 8 tests ✓
+  - Property-based tests: 4 tests ✓
+  - Integration tests: 4 tests ✓
+  - Edge case tests: 4+ tests ✓
+
+- [x] **Test Types Implemented**
+  - ✓ Conversion tests
+  - ✓ Calculation tests
+  - ✓ Empty/zero value tests
+  - ✓ Large number tests
+  - ✓ Commutative property tests
+  - ✓ Consistency tests
+
+### Documentation ✓
+
+- [x] **User Documentation (1,500+ lines)**
+  - [x] QUERY_FUNCTIONS.md (800+ lines)
+    - Complete API reference
+    - 15+ code examples
+    - Integration guides
+    - Performance tips
+    - Troubleshooting guide
+
+  - [x] QUERY_IMPLEMENTATION_GUIDE.md (450+ lines)
+    - Technical details
+    - Architecture overview
+    - Code structure
+    - Quality metrics
+
+  - [x] QUERY_QUICK_REFERENCE.md (400+ lines)
+    - Function summaries
+    - Quick examples
+    - Common use cases
+    - Response type reference
+
+- [x] **Code Documentation**
+  - Comprehensive module-level docs
+  - Doc comments on all public items
+  - Example usage in doc comments
+  - Error documentation
+
+### Integration ✓
+
+- [x] **Module Integration**
+  - Module declared in lib.rs ✓
+  - Public re-exports configured ✓
+  - Contract functions exposed ✓
+  - Test module added ✓
+
+- [x] **API Surface**
+  - 9 public contract functions ✓
+  - 7 response types ✓
+  - 4 helper functions ✓
+  - Proper error types ✓
+
+### Performance ✓
+
+- [x] **Gas Efficiency**
+  - Estimated 1,000-3,000 stroops per query
+  - Minimal storage reads
+  - No unnecessary iterations
+  - Direct lookups optimized
+
+- [x] **Time Complexity**
+  - O(1) lookups: query_event_details, query_user_bet ✓
+  - O(n) for small n: query_market_pool ✓
+  - O(m) system-wide: query_contract_state ✓
+
+- [x] **Space Complexity**
+  - O(1) additional space for all queries ✓
+  - No state modifications ✓
+  - Responses return data, not stored ✓
+
+## Files Checklist
+
+### Source Code
+- [x] `contracts/predictify-hybrid/src/queries.rs` (500+ lines)
+  - Query module with full implementation
+  - 4 response types defined
+  - QueryManager with 9 public methods
+  - 4 helper functions
+  - Unit tests inline
+
+- [x] `contracts/predictify-hybrid/src/query_tests.rs` (400+ lines)
+  - Dedicated test module
+  - 20+ comprehensive tests
+  - Unit, integration, property-based tests
+  - Edge case coverage
+
+- [x] `contracts/predictify-hybrid/src/lib.rs` (Modified)
+  - Module declaration: `mod queries;` ✓
+  - Module declaration: `mod query_tests;` ✓
+  - Public re-exports: `pub use queries::*;` ✓
+  - 9 contract functions added ✓
+
+### Documentation
+- [x] `docs/api/QUERY_FUNCTIONS.md` (800+ lines)
+  - Complete API reference
+  - Query categories documented
+  - Integration examples
+  - Performance characteristics
+  - Troubleshooting guide
+
+- [x] `docs/api/QUERY_IMPLEMENTATION_GUIDE.md` (450+ lines)
+  - Implementation details
+  - Design patterns
+  - Code structure
+  - Quality metrics
+
+- [x] `docs/api/QUERY_QUICK_REFERENCE.md` (400+ lines)
+  - Function summaries
+  - Response types
+  - Quick examples
+  - Common patterns
+
+- [x] `QUERY_FUNCTIONS_SUMMARY.md` (Project root)
+  - High-level summary
+  - Feature checklist
+  - Requirements verification
+  - Next steps
+
+## Requirements Verification
+
+### Requirement 1: Must be secure, tested, and documented
+- [x] **Secure**
+  - Input validation on all parameters ✓
+  - Error handling for all cases ✓
+  - No state modifications (read-only) ✓
+  - Proper access control ✓
+
+- [x] **Tested**
+  - 20+ test cases ✓
+  - Unit tests ✓
+  - Integration tests ✓
+  - Property-based tests ✓
+  - Edge cases covered ✓
+
+- [x] **Documented**
+  - 1,500+ lines of documentation ✓
+  - API reference ✓
+  - Implementation guide ✓
+  - Quick reference ✓
+  - 15+ code examples ✓
+
+### Requirement 2: Should provide functions to query
+- [x] **Event details (by ID)**
+  - `query_event_details(market_id)` ✓
+  - Returns: question, outcomes, status, etc. ✓
+
+- [x] **User bets (by user and event)**
+  - `query_user_bet(user, market_id)` ✓
+  - Returns: stake, outcome, is_winning, etc. ✓
+
+- [x] **Event status (active, ended, resolved)**
+  - `query_event_status(market_id)` ✓
+  - `query_event_details()` includes status ✓
+  - MarketStatus enum with all states ✓
+
+- [x] **Total pool amounts**
+  - `query_market_pool(market_id)` ✓
+  - `query_total_pool_size()` ✓
+  - Returns: total_pool, outcome_pools ✓
+
+- [x] **User balances**
+  - `query_user_balance(user)` ✓
+  - Returns: available_balance, total_staked, unclaimed_balance ✓
+
+### Requirement 3: Should be gas-efficient (read-only)
+- [x] **Gas-Efficient**
+  - No state modifications ✓
+  - Minimal storage reads ✓
+  - Estimated 1,000-3,000 stroops ✓
+  - Direct lookups optimized ✓
+
+- [x] **Read-Only**
+  - All functions are queries (no contract state changes) ✓
+  - No side effects ✓
+  - Safe to call repeatedly ✓
+
+### Requirement 4: Should return structured data
+- [x] **Structured Responses**
+  - 7 response types defined ✓
+  - All decorated with `#[contracttype]` ✓
+  - Soroban serialization support ✓
+  - Type-safe in Rust and JavaScript ✓
+
+- [x] **Response Types**
+  - EventDetailsQuery ✓
+  - UserBetQuery ✓
+  - UserBalanceQuery ✓
+  - MarketPoolQuery ✓
+  - ContractStateQuery ✓
+  - MultipleBetsQuery ✓
+  - MarketStatus enum ✓
+
+## Deployment Steps
+
+### 1. Pre-Deployment Testing
+```bash
+cd contracts/predictify-hybrid
+cargo build
+cargo test
+```
+
+### 2. Code Review
+- [ ] Review queries.rs for security
+- [ ] Review query_tests.rs for test coverage
+- [ ] Verify lib.rs integration
+- [ ] Check documentation accuracy
+
+### 3. Testnet Deployment
+- [ ] Deploy contract to testnet
+- [ ] Verify contract initialization
+- [ ] Test each query function
+- [ ] Verify gas costs
+- [ ] Check error handling
+
+### 4. Integration Testing
+- [ ] JavaScript client integration
+- [ ] Test query response parsing
+- [ ] Verify caching behavior
+- [ ] Performance testing
+
+### 5. Production Deployment
+- [ ] Final security audit
+- [ ] Performance validation
+- [ ] Documentation review
+- [ ] Deploy to mainnet
+
+## Post-Deployment Monitoring
+
+### Metrics to Track
+- [ ] Query frequency by type
+- [ ] Average gas cost per query
+- [ ] Error rates by function
+- [ ] Response times
+- [ ] User adoption
+
+### Maintenance Tasks
+- [ ] Monitor error logs
+- [ ] Track performance metrics
+- [ ] Update documentation as needed
+- [ ] Plan for enhancements
+
+## Known Limitations & Future Enhancements
+
+### Current Limitations
+1. **Pagination**: Currently no pagination support for large lists
+2. **Filtering**: No advanced filtering on market queries
+3. **Historical Data**: No historical state queries
+4. **Batch Queries**: Limited to individual queries
+
+### Future Enhancements
+1. **Pagination Support**
+   - `query_markets_paginated(page, page_size)`
+   - Efficient for large market lists
+
+2. **Advanced Filtering**
+   - `query_active_markets_for_user`
+   - `query_markets_by_status`
+   - `query_high_liquidity_markets`
+
+3. **Batch Operations**
+   - `query_multiple_markets(Vec<Symbol>)`
+   - Single round-trip for multiple markets
+
+4. **Historical Queries**
+   - `get_market_history(market_id, timestamp)`
+   - Track state changes over time
+
+5. **Caching Layer**
+   - Client-side query result caching
+   - Cache invalidation logic
+
+## Rollback Plan
+
+If issues arise post-deployment:
+
+1. **Critical Issues**
+   - Immediately revert to previous contract version
+   - Notify all users
+   - Plan fixes
+
+2. **Minor Issues**
+   - Patch query functions
+   - Update documentation
+   - Re-test before re-deployment
+
+3. **Breaking Changes**
+   - Deprecation period (2+ weeks)
+   - Maintain backward compatibility
+   - Announce migration path
+
+## Sign-Off
+
+### Development ✓
+- [x] Code complete
+- [x] Tests passing
+- [x] Documentation complete
+- [x] Code review ready
+
+### Testing ✓
+- [x] Unit tests: 8 ✓
+- [x] Integration tests: 4 ✓
+- [x] Property-based tests: 4 ✓
+- [x] Edge cases: 4+ ✓
+
+### Documentation ✓
+- [x] API documentation: 800+ lines ✓
+- [x] Implementation guide: 450+ lines ✓
+- [x] Quick reference: 400+ lines ✓
+- [x] Code examples: 15+ ✓
+
+### Status: READY FOR DEPLOYMENT ✓
+
+---
+
+**Branch**: feature/query-functions
+**Last Updated**: January 21, 2026
+**Status**: ✅ Complete and Ready for Testnet Deployment