tools: 加 cmd/dumpdb ops 工具

dumpdb 是 read-only 的 SQLite 探查工具:
  go run ./cmd/dumpdb /path/to/tts.db

输出:
- 所有表
- schema_version
- settings(敏感字段打码: api_key/auth_key/speaker_id 等)
- voices(完整行,无打码 — 这是 ops 用)
- journal_mode/page_size 等 pragmas

用法: 服务器 db 排查时,直接下 tts.db 下来用这个查,
不用 sqlite3 CLI,也不用写 SQL。

无依赖(用已有的 modernc.org/sqlite)。

未 push(收尾 commit,跟之前一起发)

cmd/dumpdb/main.go

@@ -0,0 +1,130 @@
+// dumpdb 是个 ops 工具: dump tts.db 里的 settings + voices 表(明文打码)。
+//
+// 用法:
+//   go run ./cmd/dumpdb /path/to/tts.db
+//
+// 输出 schema_version / settings(键值,敏感字段打码) / voices(完整行)。
+// 调试时方便:不依赖 sqlite3 CLI,不暴露明文 key/speaker ID。
+package main
+
+import (
+	"database/sql"
+	"fmt"
+	"os"
+
+	_ "modernc.org/sqlite"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Fprintf(os.Stderr, "usage: %s <db-path>\n", os.Args[0])
+		os.Exit(1)
+	}
+	dbPath := os.Args[1]
+
+	dsn := "file:" + dbPath + "?mode=ro&_pragma=query_only"
+	conn, err := sql.Open("sqlite", dsn)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "open: %v\n", err)
+		os.Exit(2)
+	}
+	defer conn.Close()
+
+	// 1. tables
+	fmt.Println("=== Tables ===")
+	rows, _ := conn.Query("SELECT name FROM sqlite_master WHERE type='table' ORDER BY name")
+	for rows.Next() {
+		var name string
+		_ = rows.Scan(&name)
+		fmt.Printf("  %s\n", name)
+	}
+	rows.Close()
+
+	// 2. schema_version
+	fmt.Println("\n=== schema_version ===")
+	var ver int
+	var ts string
+	err = conn.QueryRow(`SELECT version, applied_at FROM schema_version LIMIT 1`).Scan(&ver, &ts)
+	if err != nil {
+		fmt.Printf("  (no row: %v)\n", err)
+	} else {
+		fmt.Printf("  version: %d, applied_at: %s\n", ver, ts)
+	}
+
+	// 3. settings
+	fmt.Println("\n=== settings ===")
+	rows, err = conn.Query(`SELECT key, value FROM settings ORDER BY key`)
+	if err != nil {
+		fmt.Printf("  err: %v\n", err)
+	} else {
+		for rows.Next() {
+			var k, v string
+			_ = rows.Scan(&k, &v)
+			if v == "" {
+				fmt.Printf("  %-30s = (empty)\n", k)
+				continue
+			}
+			lowK := k
+			_ = lowK
+			masked := v
+			if isSensitive(k) {
+				if len(v) <= 8 {
+					masked = "****"
+				} else {
+					masked = v[:4] + "****" + v[len(v)-4:]
+				}
+			}
+			fmt.Printf("  %-30s = %s\n", k, masked)
+		}
+		rows.Close()
+	}
+
+	// 4. voices
+	fmt.Println("\n=== voices ===")
+	rows, err = conn.Query(`SELECT id, name, speaker, resource_id, model, language, description, enabled, created_at, updated_at FROM voices ORDER BY id`)
+	if err != nil {
+		fmt.Printf("  err: %v\n", err)
+	} else {
+		count := 0
+		for rows.Next() {
+			count++
+			var id int64
+			var name, speaker, resourceID, model, lang, desc, created, updated string
+			var enabled int
+			_ = rows.Scan(&id, &name, &speaker, &resourceID, &model, &lang, &desc, &enabled, &created, &updated)
+			en := "true"
+			if enabled == 0 {
+				en = "false"
+			}
+			fmt.Printf("  [%d] name=%s\n      speaker=%s\n      resource_id=%s\n      model=%s\n      lang=%s enabled=%s\n      created=%s updated=%s\n",
+				id, name, speaker, resourceID, model, lang, en, created, updated)
+			if desc != "" {
+				fmt.Printf("      desc: %s\n", desc)
+			}
+		}
+		fmt.Printf("  total: %d\n", count)
+		rows.Close()
+	}
+
+	// 5. pragmas
+	fmt.Println("\n=== Pragmas ===")
+	for _, p := range []string{"journal_mode", "synchronous", "foreign_keys", "page_size", "page_count"} {
+		var v string
+		_ = conn.QueryRow("PRAGMA " + p).Scan(&v)
+		fmt.Printf("  %-15s = %s\n", p, v)
+	}
+}
+
+func isSensitive(key string) bool {
+	lowK := key
+	// 简单 contains (不引 strings 包保持精简)
+	markers := []string{"key", "token", "speaker"}
+	for _, m := range markers {
+		for i := 0; i+len(m) <= len(lowK); i++ {
+			if lowK[i:i+len(m)] == m {
+				return true
+			}
+		}
+	}
+	return false
+}