Use materialized views for subscription feeds

src/invidious/helpers/helpers.cr

@@ -15,6 +15,7 @@ class Config
     hmac_key:     String?,
     full_refresh: Bool,
     geo_bypass:   Bool,
+    update_feeds: Bool,
   })
 end
 

src/invidious/helpers/utils.cr

@@ -238,3 +238,9 @@ def write_var_int(value : Int)
 
   return bytes
 end
+
+def sha256(text)
+  digest = OpenSSL::Digest.new("SHA256")
+  digest << text
+  return digest.hexdigest
+end