# Progress Log: flatten_structure Task

## Task Objective
Update entire codebase to call `query_run_sqlite` directly instead of using `DatabaseConnection::SQLite()` initialization and `db_conn.query_run()` pattern.

## Current Status
**IN PROGRESS** - Partial completion of test file updates

## Completed Work (✅ DONE)

### File: `tests/enumif_tests.rs`
- **Status:** ✅ FULLY UPDATED
- **Changes Made:**
  - Removed `DatabaseConnection, QueryRunner` from imports
  - Added `query_run_sqlite` to imports
  - Updated 5 test functions with DatabaseConnection usage
  - All calls changed from `db_conn.query_run(...)` to `query_run_sqlite(&mut conn, ...)`
  - Made connection variables mutable where required
- **Verification:** ✅ All 7 tests pass

### File: `tests/resource_queries_tests.rs`
- **Status:** ✅ FULLY UPDATED
- **Changes Made:**
  - Removed `DatabaseConnection, QueryRunner` from imports
  - Added `query_run_sqlite` to imports
  - Updated 6 test functions with DatabaseConnection usage
  - All calls changed from `db_conn.query_run(...)` to `query_run_sqlite(&mut conn, ...)`
  - Made connection variables mutable where required
- **Verification:** ✅ All 7 tests pass

### Import Updates
- **Status:** ✅ COMPLETED for updated files
- **Pattern Established:** Remove `DatabaseConnection, QueryRunner`, add `query_run_sqlite`

## Remaining Work (⏳ TODO)

### High Priority Files
#### File: `tests/comprehensive_tests.rs`
- **Status:** ⚠️ NOT STARTED
- **Scope:** Large file with extensive DatabaseConnection usage
- **Test Functions to Update:** ~15+ test functions
- **Estimated Effort:** High (most complex file)

#### File: `tests/error_handling.rs`
- **Status:** ⚠️ PARTIALLY DONE
- **Details:** Updated imports to use `query_run_sqlite`, several test functions converted. Many remaining DatabaseConnection references causing compilation errors.
- **Test Functions Updated:** 4/25+ test functions converted (partial: test_query_not_found, test_parameter_type_mismatch, test_parameter_validation_range, test_parameter_validation_range_non_numeric)
- **Remaining:** ~20+ test functions still need DatabaseConnection pattern replacement
- **Estimated Effort:** High (remaining work extensive)

### Potential Next Steps
1. Complete `tests/comprehensive_tests.rs` (bulk replacement needed)
2. Complete `tests/error_handling.rs` (selective updates)
3. Run full test suite to verify all changes
4. Consider updating remaining library/example code if any exists

## Code Changes Pattern
```rust
// BEFORE:
use jankensqlhub::{DatabaseConnection, QueryRunner, ...};
let mut db_conn = DatabaseConnection::SQLite(conn);
// ... setup ...
let result = db_conn.query_run(&queries, "query_name", &params);

// AFTER:
use jankensqlhub::{query_run_sqlite, ...};
let mut conn = Connection::open_in_memory().unwrap();
// ... setup ...
let result = query_run_sqlite(&mut conn, &queries, "query_name", &params);
```

## Quality Assurance
- ✅ **Compilation:** Updated files compile without errors
- ✅ **Functionality:** No behavioral changes - all existing test assertions pass
- ✅ **Performance:** Direct calls eliminate abstraction layer
- ⚠️ **Coverage:** Only 2/4 target files completed (50% done)

## Technical Details
- **Signature:** `query_run_sqlite(conn: &mut Connection, queries: &QueryDefinitions, query_name: &str, params: &serde_json::Value)`
- **Key Change:** Eliminates intermediate `DatabaseConnection` enum and `QueryRunner` trait
- **Impact:** Direct interface to SQLite execution, removes one indirection layer

## Blockers/Notes
- Remaining files are larger and more complex
- Pattern is well-established and tested
- No architectural or functional risks identified
- Progress can be resumed by another agent using this file

## Next Session Checklist
1. Read this progress file
2. Verify current state with `cargo test`
3. Complete remaining files following established pattern
4. Run full test suite validation
5. Consider cleanup of unused imports if any remain
