chore: snapshot production code before Apple Design UI refinement

tmp/g7-mileage-history-20260724/schema_probe.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"database/sql"
+	"encoding/json"
+	"fmt"
+	"os"
+	"strings"
+
+	_ "github.com/go-sql-driver/mysql"
+)
+
+func main() {
+	dsn := strings.TrimSpace(os.Getenv("MYSQL_DSN"))
+	if dsn == "" {
+		panic("MYSQL_DSN is required")
+	}
+	db, err := sql.Open("mysql", dsn)
+	if err != nil {
+		panic(err)
+	}
+	defer db.Close()
+	for _, table := range []string{
+		"vehicle_data_source",
+		"vehicle_daily_mileage_source",
+		"vehicle_daily_mileage",
+		"vehicle",
+		"vehicle_identifier",
+	} {
+		var name, ddl string
+		if err := db.QueryRow("SHOW CREATE TABLE "+table).Scan(&name, &ddl); err != nil {
+			panic(err)
+		}
+		fmt.Printf("=== %s ===\n%s\n", name, ddl)
+	}
+	rows, err := db.Query("SELECT * FROM vehicle_data_source WHERE id = 661200")
+	if err != nil {
+		panic(err)
+	}
+	defer rows.Close()
+	columns, err := rows.Columns()
+	if err != nil {
+		panic(err)
+	}
+	if rows.Next() {
+		values := make([]any, len(columns))
+		pointers := make([]any, len(columns))
+		for i := range values {
+			pointers[i] = &values[i]
+		}
+		if err := rows.Scan(pointers...); err != nil {
+			panic(err)
+		}
+		record := make(map[string]any, len(columns))
+		for i, column := range columns {
+			switch value := values[i].(type) {
+			case []byte:
+				record[column] = string(value)
+			default:
+				record[column] = value
+			}
+		}
+		data, _ := json.Marshal(record)
+		fmt.Printf("=== source_661200 ===\n%s\n", data)
+	}
+}