fix: UDP-logged QSOs fall back to the offline outbox on DB failure (were silently lost); speed up MySQL connect (batch migration checks into 1 query, connect direct-to-DB first) — was ~40s on a high-latency link

internal/db/mysql.go

@@ -137,10 +137,6 @@ func OpenMySQL(c MySQLConfig) (*sql.DB, error) {
 	if !validDBIdent(name) {
 		return nil, fmt.Errorf("invalid database name %q (letters, digits, underscore only)", name)
 	}
-	// Ensure the database exists (connect server-level first).
-	if err := PingMySQL(c); err != nil {
-		return nil, err
-	}
 	conn, err := sql.Open("mysql", c.dsn())
 	if err != nil {
 		return nil, fmt.Errorf("open mysql: %w", err)
@@ -157,9 +153,28 @@ func OpenMySQL(c MySQLConfig) (*sql.DB, error) {
 	// (surfacing as "Unknown database"). Idle connections are still recycled
 	// after 90s, and the driver retries stale pooled connections.
 	conn.SetConnMaxLifetime(0)
+	// Connect DIRECTLY to the database first. Only if that fails — the DB doesn't
+	// exist yet (first-time setup) or the server is unreachable — do we pay for the
+	// server-level connect + CREATE DATABASE (two more handshakes). On a normal
+	// startup against an existing DB this halves the connection round-trips, which
+	// matters a lot on a high-latency remote MySQL (each handshake is several RTTs).
 	if err := conn.Ping(); err != nil {
 		_ = conn.Close()
-		return nil, fmt.Errorf("connect to %s: %w", name, err)
+		if perr := PingMySQL(c); perr != nil {
+			return nil, perr // creates the DB (or returns a clear "cannot create" error)
+		}
+		conn, err = sql.Open("mysql", c.dsn())
+		if err != nil {
+			return nil, fmt.Errorf("open mysql: %w", err)
+		}
+		conn.SetMaxOpenConns(50)
+		conn.SetMaxIdleConns(10)
+		conn.SetConnMaxIdleTime(90 * time.Second)
+		conn.SetConnMaxLifetime(0)
+		if err := conn.Ping(); err != nil {
+			_ = conn.Close()
+			return nil, fmt.Errorf("connect to %s: %w", name, err)
+		}
 	}
 	// Set the dialect before migrating so the runner takes the MySQL path
 	// (per-statement, idempotent) rather than the SQLite transaction path.