add rpc method to export feedbrowser data; update schema

schema/ttrss_schema_mysql.sql

@@ -429,6 +429,7 @@ create table ttrss_access_keys (id integer not null primary key auto_increment,
   	foreign key (owner_uid) references ttrss_users(id) ON DELETE CASCADE) TYPE=InnoDB DEFAULT CHARSET=UTF8;
 
 create table ttrss_linked_instances (id integer not null primary key auto_increment,
+	last_connected datetime not null,
 	access_key varchar(250) not null,
 	access_url text not null) TYPE=InnoDB DEFAULT CHARSET=UTF8;
 

schema/ttrss_schema_pgsql.sql

@@ -389,6 +389,7 @@ create table ttrss_access_keys (id serial not null primary key,
 	owner_uid integer not null references ttrss_users(id) on delete cascade);
 
 create table ttrss_linked_instances (id serial not null primary key,
+	last_connected timestamp not null,
 	access_key varchar(250) not null,
 	access_url text not null);
 

schema/versions/mysql/84.sql

@@ -1,6 +1,7 @@
 begin;
 
 create table ttrss_linked_instances (id integer not null primary key auto_increment,
+	last_connected timestamp not null,
 	access_key varchar(250) not null,
 	access_url text not null) TYPE=InnoDB DEFAULT CHARSET=UTF8;
 

schema/versions/pgsql/84.sql

@@ -1,6 +1,7 @@
 begin;
 
 create table ttrss_linked_instances (id serial not null primary key,
+	last_connected datetime not null,
 	access_key varchar(250) not null,
 	access_url text not null);