feat: added the sqlite logging main logic

added sqlite logic which is being used across the files to log whitelist requests

sqlite_logger.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"database/sql"
+	"log/slog"
+	"time"
+
+	_ "modernc.org/sqlite"
+)
+
+func initDB(dbPath string) (*sql.DB, error) {
+	db, err := sql.Open("sqlite", dbPath)
+	if err != nil {
+		return nil, err
+	}
+	query := `
+	CREATE TABLE IF NOT EXISTS whitelist_audit (
+		id INTEGER PRIMARY KEY AUTOINCREMENT,
+		timestamp DATETIME NOT NULL,
+		action TEXT NOT NULL,
+		ip TEXT NOT NULL,
+		ttl_seconds INTEGER DEFAULT 0,
+		reason TEXT,
+		api_user TEXT
+	);
+	CREATE INDEX IF NOT EXISTS idx_timestamp ON whitelist_audit(timestamp);
+	`
+	_, err = db.Exec(query)
+	if err != nil {
+		return nil, err
+	}
+	return db, nil
+}
+
+func logWhitelistEvent(db *sql.DB, action, ip string, ttl int, reason, apiUser string) {
+	_, err := db.Exec(
+		`INSERT INTO whitelist_audit(timestamp, action, ip, ttl_seconds, reason, api_user)
+		VALUES(?, ?, ?, ?, ?, ?)`,
+		time.Now(), action, ip, ttl, reason, apiUser,
+	)
+	if err != nil {
+		slog.Error("failed to log whitelist event", "error", err)
+	}
+}