* fixed formating/comments in users schema

* channels schema now uses a bigint unsigned for pid
this is to keep consistent with notion of id's being usize|u64 in rust
* foreign key constraint added to keys table referencing user rows

server/migrations/2020-06-02-055256_keys/up.sql

@@ -3,8 +3,10 @@
 -- Limits that are null just mean the limit does not exist
 
 CREATE TABLE IF NOT EXISTS `keys`(
-    `id` varchar(64) NOT NULL,
+    `secret` varchar(255) NOT NULL,
     `limit` integer,
     `uses` integer, 
-    PRIMARY KEY(`id`)
+    `userid` bigint unsigned NOT NULL,
+    PRIMARY KEY(`secret`),
+    FOREIGN KEY `userid` REFERENCES users(`id`)
 );