v1.9.2 缓存默认时效改为7天 + 支持-1永久缓存 + 重试间隔默认15秒

1) 缓存时效: 默认 ttl_seconds 3600→604800(7天); ttl_seconds=-1 表示永久有效(不按时间过滤, 历史有成功记录就一直命中), 全局配置与 per-request cache_ttl_seconds 均支持
2) 重试间隔: 默认 delay_seconds 2→15秒
3) 前端: 徽章/弹窗显示7天或永久(fmtTtl), 有效期输入框支持-1, 保存换算-1原样存储, API文档同步(-1=永久说明)
验证: 7天TTL命中今日记录 / ttl=-1命中超7天旧记录(0.0098s返回PNG, 源站已挂仍可用) / 恢复默认

app.py

@@ -260,10 +260,10 @@ def save_smart_config(cfg):
 
 
 # ===== 网址缓存 + 失败重试 配置 =====
-# cache:   enabled=是否启用网址缓存(命中直接返回历史, 不重新提取); ttl_seconds=缓存有效期(秒)
-# retry:   max_retries=提取失败后的重试次数(默认2, 即最多尝试3次); delay_seconds=每次重试间隔(秒)
-DEFAULT_CACHE_CONFIG = {"enabled": True, "ttl_seconds": 3600}
-DEFAULT_RETRY_CONFIG = {"max_retries": 2, "delay_seconds": 2}
+# cache:   enabled=是否启用网址缓存(命中直接返回历史, 不重新提取); ttl_seconds=缓存有效期(秒, 默认7天, -1=永久有效)
+# retry:   max_retries=提取失败后的重试次数(默认2, 即最多尝试3次); delay_seconds=每次重试间隔(秒, 默认15)
+DEFAULT_CACHE_CONFIG = {"enabled": True, "ttl_seconds": 7 * 24 * 3600}   # 7天
+DEFAULT_RETRY_CONFIG = {"max_retries": 2, "delay_seconds": 15}
 
 
 def load_capture_settings():
@@ -310,17 +310,28 @@ def save_capture_settings(settings):
 def find_cache_hit(url, action, ttl_seconds):
     """
     按 url+action 在提取历史中查缓存：取最近一条成功记录，且创建时间在 TTL 内。
+    ttl_seconds < 0 表示永久有效（不按时间过滤）。
     命中返回 dict(记录)，未命中返回 None。
     """
-    from datetime import timedelta
-    cutoff = (datetime.now() - timedelta(seconds=max(1, int(ttl_seconds)))).strftime("%Y-%m-%d %H:%M:%S")
     conn = get_db()
-    row = conn.execute(
-        "SELECT id, url, title, backend, file_path, content, html_path, created_at FROM captures "
-        "WHERE url=? AND action=? AND status='success' AND created_at >= ? "
-        "ORDER BY id DESC LIMIT 1",
-        (url, action, cutoff)
-    ).fetchone()
+    ttl = int(ttl_seconds)
+    if ttl < 0:
+        # 永久有效
+        row = conn.execute(
+            "SELECT id, url, title, backend, file_path, content, html_path, created_at FROM captures "
+            "WHERE url=? AND action=? AND status='success' "
+            "ORDER BY id DESC LIMIT 1",
+            (url, action)
+        ).fetchone()
+    else:
+        from datetime import timedelta
+        cutoff = (datetime.now() - timedelta(seconds=max(1, ttl))).strftime("%Y-%m-%d %H:%M:%S")
+        row = conn.execute(
+            "SELECT id, url, title, backend, file_path, content, html_path, created_at FROM captures "
+            "WHERE url=? AND action=? AND status='success' AND created_at >= ? "
+            "ORDER BY id DESC LIMIT 1",
+            (url, action, cutoff)
+        ).fetchone()
     conn.close()
     return dict(row) if row else None
 
@@ -1585,7 +1596,7 @@ def capture():
         "action": "screenshot" | "html" | "text" | "smart",
         "refresh": false,       // 可选：true=强制实时提取(绕过网址缓存)
         "cache": true,          // 可选：false=本次请求禁用缓存
-        "cache_ttl_seconds": 3600,  // 可选：本次请求的缓存时效(秒)，覆盖全局设置；命中判定也用它
+        "cache_ttl_seconds": 604800,  // 可选：本次请求的缓存时效(秒, -1=永久)，覆盖全局设置；命中判定也用它
         "scroll_times": 0,
         "scroll_delay": 1000,
         "full_page": false,
@@ -1639,10 +1650,11 @@ def capture():
     cache_cfg = settings.get("cache", DEFAULT_CACHE_CONFIG)
     retry_cfg = settings.get("retry", DEFAULT_RETRY_CONFIG)
     force_refresh = bool(data.get("refresh") or data.get("force"))
-    # per-request 缓存参数：cache_ttl_seconds=本次缓存时效(覆盖全局)，cache=false / no_cache=true=本次禁用缓存
+    # per-request 缓存参数：cache_ttl_seconds=本次缓存时效(秒, -1=永久, 覆盖全局)，cache=false / no_cache=true=本次禁用缓存
     no_cache = data.get("cache") is False or str(data.get("no_cache")).lower() in ("true", "1", "yes")
     try:
-        cache_ttl_override = max(1, int(data.get("cache_ttl_seconds"))) if data.get("cache_ttl_seconds") is not None else None
+        v = int(data.get("cache_ttl_seconds"))
+        cache_ttl_override = v if v != 0 else None
     except Exception:
         cache_ttl_override = None