add initial version of DB schema

001-usecases.md

@@ -5,6 +5,7 @@ Interviewr is an app to simplify and enhance interview process
 ## Status
 
 * 2018-04-21: proposed
+* 2018-04-22: accepted
 
 ## Context
 

002-db-schema.md

@@ -0,0 +1,88 @@
+# 002 - Template
+
+DB Schema by use cases from [001-usecases.md](./usecases.md)
+
+## Status
+
+* 2018-04-27: proposed
+* 2018-05-09: updated
+
+## Context
+
+By the defined use cases in the previous ADR to design a DB schema and describe all data
+
+## Decision
+
+* Use RDMS like Postgres
+* Initial SQL script like the following: 
+
+```sql
+CREATE TABLE person (
+  id SERIAL PRIMARY KEY,
+  login VARCHAR(20) NOT NULL,
+  name VARCHAR(35) NOT NULL,
+  email VARCHAR(35) UNIQUE NOT NULL,
+  location VARCHAR(50),
+  bio VARCHAR,
+  avatar_url VARCHAR
+);
+
+CREATE TABLE organization (
+  id SERIAL PRIMARY KEY,
+  name VARCHAR(35) NOT NULL,
+  email VARCHAR(35) UNIQUE NOT NULL,
+  description VARCHAR,
+  location VARCHAR(50),
+  avatar_url VARCHAR
+);
+
+CREATE TABLE membership (
+  organization_id INT REFERENCES organization(id),
+  person_id INT REFERENCES person(id),
+  role VARCHAR CHECK (role IN ('owner', 'member')),
+  CONSTRAINT membership_id PRIMARY KEY (organization_id, person_id)
+);
+
+CREATE TABLE vacancy (
+  id SERIAL PRIMARY KEY,
+  title VARCHAR(30) NOT NULL,
+  description VARCHAR NOT NULL,
+  location VARCHAR(50),
+  organization_id INT REFERENCES organization(id)
+);
+
+CREATE TABLE applicant (
+  vacancy_id INT REFERENCES vacancy(id),
+  person_id INT REFERENCES person(id),
+  CONSTRAINT applicant_id PRIMARY KEY (vacancy_id, person_id)
+);
+
+CREATE TABLE test (
+  id SERIAL PRIMARY KEY,
+  title VARCHAR(30) NOT NULL,
+  vacancy_id INT REFERENCES vacancy(id)
+);
+
+CREATE TABLE question (
+  id SERIAL PRIMARY KEY,
+  description VARCHAR NOT NULL,
+  test_id INT REFERENCES test(id),
+);
+
+CREATE TABLE answer (
+  id SERIAL PRIMARY KEY,
+  description VARCHAR NOT NULL,
+  is_correct BOOLEAN NOT NULL,
+  question_id INT REFERENCES question(id)
+);
+
+CREATE TABLE test_result (
+  id SERIAL PRIMARY KEY,
+  applicant_id INT REFERENCES applicant(id),
+  answer_id INT REFERENCES answer(id)
+);
+```
+
+## Consequences
+
+TBD

SUMMARY.md

@@ -1,3 +1,4 @@
 # Summary
 
 * [001 - Use cases](001-usecases.md)
+* [002 - DB Schema](002-db-schema.md)