rate-limit requests for favicons when not present to conserve traffic (refs #457)

schema/ttrss_schema_mysql.sql

@@ -119,6 +119,7 @@ create table ttrss_feeds (id integer not null auto_increment primary key,
 	update_on_checksum_change boolean not null default false,
 	strip_images boolean not null default false,
 	pubsub_state integer not null default 0,
+	favicon_last_checked datetime default null,
 	index(owner_uid),
 	foreign key (owner_uid) references ttrss_users(id) ON DELETE CASCADE,
 	index(cat_id),
@@ -260,7 +261,7 @@ create table ttrss_tags (id integer primary key auto_increment,
 
 create table ttrss_version (schema_version int not null) ENGINE=InnoDB DEFAULT CHARSET=UTF8;
 
-insert into ttrss_version values (91);
+insert into ttrss_version values (92);
 
 create table ttrss_enclosures (id integer primary key auto_increment,
 	content_url text not null,

schema/ttrss_schema_pgsql.sql

@@ -82,6 +82,7 @@ create table ttrss_feeds (id serial not null primary key,
 	update_on_checksum_change boolean not null default false,
 	strip_images boolean not null default false,
 	pubsub_state integer not null default 0,
+	favicon_last_checked timestamp default null,
 	auth_pass_encrypted boolean not null default false);
 
 create index ttrss_feeds_owner_uid_index on ttrss_feeds(owner_uid);
@@ -229,7 +230,7 @@ create index ttrss_tags_post_int_id_idx on ttrss_tags(post_int_id);
 
 create table ttrss_version (schema_version int not null);
 
-insert into ttrss_version values (91);
+insert into ttrss_version values (92);
 
 create table ttrss_enclosures (id serial not null primary key,
 	content_url text not null,

schema/versions/mysql/92.sql

@@ -0,0 +1,8 @@
+begin;
+
+alter table ttrss_feeds add column favicon_last_checked datetime;
+alter table ttrss_feeds alter column favicon_last_checked set default null;
+
+update ttrss_version set schema_version = 92;
+
+commit;

schema/versions/pgsql/92.sql

@@ -0,0 +1,8 @@
+begin;
+
+alter table ttrss_feeds add column favicon_last_checked timestamp;
+alter table ttrss_feeds alter column favicon_last_checked set default null;
+
+update ttrss_version set schema_version = 92;
+
+commit;