refactor: reference human id instead of email (#73)

* refactor: update api and client to reference humanIds

* fix: prevent deletion of network member

This may cause various side effects if there is data in other services
which reference this member

go/migrations/000002_networks.up.sql

@@ -1,13 +1,13 @@
 CREATE TABLE networks (
   id TEXT PRIMARY KEY,
   name VARCHAR(255) NOT NULL,
-  admin_email VARCHAR(255) NOT NULL,
+  admin_human_id VARCHAR(255) NOT NULL,
   created_at TIMESTAMPTZ DEFAULT NOW()
 );
 
 CREATE TABLE network_members (
   network_id TEXT NOT NULL REFERENCES networks(id) ON DELETE CASCADE,
-  email VARCHAR(255) NOT NULL,
+  human_id VARCHAR(255) NOT NULL,
   joined_at TIMESTAMPTZ DEFAULT NOW(),
-  PRIMARY KEY (network_id, email)
+  PRIMARY KEY (network_id, human_id)
 );

go/migrations/000008_network_invitations.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS network_invitations;

go/migrations/000008_network_invitations.up.sql

@@ -0,0 +1,6 @@
+CREATE TABLE network_invitations (
+    network_id TEXT NOT NULL REFERENCES networks(id) ON DELETE CASCADE,
+    email VARCHAR(255) NOT NULL,
+    created_at TIMESTAMPTZ DEFAULT NOW(),
+    PRIMARY KEY (network_id, email)
+);