Service login (#6)

Reviewed-on: phoenix/textsender-auth#6

migrations/schema.sql

@@ -1,32 +0,0 @@
--- CREATE EXTENSION IF NOT EXISTS pgcrypto;
--- CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
--- 
--- DROP TABLE IF EXISTS "user" CASCADE;
--- DROP TABLE IF EXISTS "salt" CASCADE;
--- DROP TABLE IF EXISTS "service_user" CASCADE;
--- 
--- CREATE TABLE IF NOT EXISTS "user" (
---     id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
---     first_name TEXT NOT NULL,
---     last_name TEXT NOT NULL,
---     phone_number TEXT NOT NULL,
---     username TEXT NOT NULL,
---     password TEXT NOT NULL,
---     created TIMESTAMPTZ NOT NULL DEFAULT NOW(),
---     last_login TIMESTAMPTZ NOT NULL DEFAULT NOW(),
---     salt_id UUID NOT NULL
--- );
--- 
--- 
--- CREATE TABLE IF NOT EXISTS "salt" (
---     id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
---     salt TEXT NOT NULL
--- );
--- 
--- CREATE TABLE IF NOT EXISTS "service_user" (
---     id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
---     username TEXT NOT NULL,
---     passphrase TEXT NOT NULL,
---     created TIMESTAMPTZ NOT NULL DEFAULT NOW(),
---     last_login timestamptz NULL
--- );