feat: implement usage tracker + quotas

backend/migrations/20221210194626_usage_tracker.down.sql

@@ -0,0 +1 @@
+-- Add down migration script here

backend/migrations/20221210194626_usage_tracker.up.sql

@@ -0,0 +1,8 @@
+-- Add up migration script here
+CREATE TABLE usage (
+    id VARCHAR(50) NOT NULL,
+    is_workspace BOOLEAN NOT NULL,
+    month_ INTEGER NOT NULL,
+    usage INTEGER NOT NULL,
+    PRIMARY KEY (id, is_workspace, month_)
+);

backend/migrations/20221211055346_emails_everywhere.down.sql

@@ -0,0 +1,5 @@
+-- Add down migration script here
+ALTER TABLE queue DROP COLUMN email; 
+ALTER TABLE workspace_settings DROP COLUMN slack_email; 
+ALTER TABLE schedule DROP COLUMN email; 
+ALTER TABLE schedule DROP COLUMN error; 

backend/migrations/20221211055346_emails_everywhere.up.sql

@@ -0,0 +1,6 @@
+-- Add up migration script here
+ALTER TABLE queue ADD COLUMN email VARCHAR(50) NOT NULL DEFAULT 'missing@email.xyz'; 
+ALTER TABLE workspace_settings ADD COLUMN slack_email VARCHAR(50) NOT NULL DEFAULT 'missing@email.xyz';;
+ALTER TABLE schedule ADD COLUMN email VARCHAR(50) NOT NULL DEFAULT 'missing@email.xyz';  
+ALTER TABLE schedule ADD COLUMN error TEXT;  
+