Remove SQLite pragmas that set default values

- Remove page_size, wal_autocheckpoint, locking_mode, mmap_size
- Keep only pragmas that change behavior from defaults
- Increase cache size to 3GB (upper limit for 2.4GB database)

internal/database/database.go

@@ -98,18 +98,14 @@ func New(cfg *config.Config, logger *logger.Logger) (*Database, error) {
 
 // Initialize creates the database schema if it doesn't exist.
 func (d *Database) Initialize() error {
-	// Set SQLite pragmas for reasonable performance with better reliability
+	// Set SQLite pragmas for performance
 	pragmas := []string{
-		"PRAGMA journal_mode=WAL",         // Write-Ahead Logging (good default)
+		"PRAGMA journal_mode=WAL",         // Write-Ahead Logging
 		"PRAGMA synchronous=OFF",          // Don't wait for disk writes
-		"PRAGMA cache_size=-524288",       // 512MB cache (reasonable for 2.4GB DB)
+		"PRAGMA cache_size=-3145728",      // 3GB cache (upper limit for 2.4GB DB)
 		"PRAGMA temp_store=MEMORY",        // Use memory for temp tables
-		"PRAGMA mmap_size=268435456",      // 256MB memory-mapped I/O (reasonable default)
-		"PRAGMA page_size=4096",           // 4KB pages (SQLite default)
-		"PRAGMA wal_autocheckpoint=1000",  // Checkpoint every 1000 pages (4MB) - default
 		"PRAGMA wal_checkpoint(TRUNCATE)", // Checkpoint and truncate WAL now
 		"PRAGMA busy_timeout=5000",        // 5 second busy timeout
-		"PRAGMA locking_mode=NORMAL",      // Normal locking for multiple connections
 		"PRAGMA analysis_limit=0",         // Disable automatic ANALYZE
 	}