fix(multicall): resolve critical multicall parsing corruption issues

- Added comprehensive bounds checking to prevent buffer overruns in multicall parsing
- Implemented graduated validation system (Strict/Moderate/Permissive) to reduce false positives
- Added LRU caching system for address validation with 10-minute TTL
- Enhanced ABI decoder with missing Universal Router and Arbitrum-specific DEX signatures
- Fixed duplicate function declarations and import conflicts across multiple files
- Added error recovery mechanisms with multiple fallback strategies
- Updated tests to handle new validation behavior for suspicious addresses
- Fixed parser test expectations for improved validation system
- Applied gofmt formatting fixes to ensure code style compliance
- Fixed mutex copying issues in monitoring package by introducing MetricsSnapshot
- Resolved critical security vulnerabilities in heuristic address extraction
- Progress: Updated TODO audit from 10% to 35% complete

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

pkg/database/database.go

@@ -8,9 +8,10 @@ import (
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
+	_ "github.com/mattn/go-sqlite3"
+
 	"github.com/fraktal/mev-beta/internal/config"
 	"github.com/fraktal/mev-beta/internal/logger"
-	_ "github.com/mattn/go-sqlite3"
 )
 
 // Database represents the database connection and operations
@@ -155,6 +156,8 @@ func (d *Database) initSchema() error {
 		amount1_in TEXT NOT NULL,
 		amount0_out TEXT NOT NULL,
 		amount1_out TEXT NOT NULL,
+		sender TEXT NOT NULL,
+		recipient TEXT NOT NULL,
 		amount_in_usd REAL NOT NULL,
 		amount_out_usd REAL NOT NULL,
 		fee_usd REAL NOT NULL,
@@ -162,6 +165,7 @@ func (d *Database) initSchema() error {
 		sqrt_price_x96 TEXT NOT NULL,
 		liquidity TEXT NOT NULL,
 		tick INTEGER NOT NULL,
+		fee INTEGER NOT NULL,
 		created_at DATETIME DEFAULT CURRENT_TIMESTAMP
 	)`); err != nil {
 		return fmt.Errorf("failed to create swap_events table: %w", err)

pkg/database/database_test.go

@@ -6,10 +6,11 @@ import (
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
-	"github.com/fraktal/mev-beta/internal/config"
-	"github.com/fraktal/mev-beta/internal/logger"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+
+	"github.com/fraktal/mev-beta/internal/config"
+	"github.com/fraktal/mev-beta/internal/logger"
 )
 
 func TestDatabaseOperations(t *testing.T) {
@@ -40,7 +41,7 @@ func TestDatabaseOperations(t *testing.T) {
 		Amount1In:   big.NewInt(0),
 		Amount0Out:  big.NewInt(0),
 		Amount1Out:  big.NewInt(500000000000000000), // 0.5 WETH
-		Owner:       common.HexToAddress("0x1234567890abcdef1234567890abcdef12345678"),
+		Sender:      common.HexToAddress("0x1234567890abcdef1234567890abcdef12345678"),
 		Recipient:   common.HexToAddress("0x8765432109fedcba8765432109fedcba87654321"),
 		Protocol:    "uniswap_v3",
 	}
@@ -59,8 +60,6 @@ func TestDatabaseOperations(t *testing.T) {
 		Liquidity:   big.NewInt(1000000000000000000),                                   // 1 ETH equivalent
 		Amount0:     big.NewInt(2000000000),                                            // 2000 USDC
 		Amount1:     big.NewInt(1000000000000000000),                                   // 1 WETH
-		Owner:       common.HexToAddress("0x1234567890abcdef1234567890abcdef12345678"),
-		Recipient:   common.HexToAddress("0x8765432109fedcba8765432109fedcba87654321"),
 		EventType:   "add",
 		Protocol:    "uniswap_v3",
 	}