commit 7db3cb696d1db669a29e3df8662bb25cbce33aec
Author: Bùi Thành Nhân <hi@imnhan.com>
Date:   Fri Jan 29 16:11:08 2021 +0700

    also look for pages_alt when checking img url

diff --git a/src/pytaku/persistence.py b/src/pytaku/persistence.py
index cf145a7..3747a16 100644
--- a/src/pytaku/persistence.py
+++ b/src/pytaku/persistence.py
@@ -402,10 +402,14 @@ def is_manga_page_url(url):
     Checks if url exists in db as a page image.
     This is currently used to avoid abuse of our /proxy/ endpoint.
     """
-    result = run_sql(
-        """
-        SELECT 1 FROM chapter, json_each(pages) WHERE value = ? LIMIT 1;
-        """,
-        (url,),
-    )
-    return len(result) == 1
+    is_page = run_sql(
+        "SELECT 1 FROM chapter, json_each(pages) WHERE value = ? LIMIT 1;", (url,)
+    ) == [1]
+    if is_page:
+        return True
+
+    is_page_alt = run_sql(
+        "SELECT 1 FROM chapter, json_each(pages_alt) WHERE value = ? LIMIT 1;", (url,)
+    ) == [1]
+
+    return is_page_alt