build multi tenant

docs/database_schema.md

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+# Database Schema Design for Multi-Tenant Geek-Life
+
+## Overview
+This document outlines the PostgreSQL database schema for the multi-tenant version of Geek-Life.
+
+## Tables
+
+### tenants
+- id (BIGSERIAL PRIMARY KEY)
+- name (VARCHAR(255) NOT NULL)
+- created_at (TIMESTAMP NOT NULL DEFAULT NOW())
+- updated_at (TIMESTAMP NOT NULL DEFAULT NOW())
+
+### users
+- id (BIGSERIAL PRIMARY KEY)
+- tenant_id (BIGINT NOT NULL REFERENCES tenants(id))
+- username (VARCHAR(100) NOT NULL)
+- email (VARCHAR(255) NOT NULL)
+- password_hash (VARCHAR(255) NOT NULL)
+- created_at (TIMESTAMP NOT NULL DEFAULT NOW())
+- updated_at (TIMESTAMP NOT NULL DEFAULT NOW())
+- UNIQUE(tenant_id, username)
+- UNIQUE(tenant_id, email)
+
+### projects
+- id (BIGSERIAL PRIMARY KEY)
+- tenant_id (BIGINT NOT NULL REFERENCES tenants(id))
+- user_id (BIGINT NOT NULL REFERENCES users(id))
+- title (VARCHAR(255) NOT NULL)
+- uuid (UUID NOT NULL DEFAULT gen_random_uuid())
+- created_at (TIMESTAMP NOT NULL DEFAULT NOW())
+- updated_at (TIMESTAMP NOT NULL DEFAULT NOW())
+- INDEX(tenant_id, user_id)
+- UNIQUE(uuid)
+
+### tasks
+- id (BIGSERIAL PRIMARY KEY)
+- tenant_id (BIGINT NOT NULL REFERENCES tenants(id))
+- user_id (BIGINT NOT NULL REFERENCES users(id))
+- project_id (BIGINT NOT NULL REFERENCES projects(id))
+- uuid (UUID NOT NULL DEFAULT gen_random_uuid())
+- title (VARCHAR(500) NOT NULL)
+- details (TEXT)
+- completed (BOOLEAN NOT NULL DEFAULT FALSE)
+- due_date (TIMESTAMP)
+- created_at (TIMESTAMP NOT NULL DEFAULT NOW())
+- updated_at (TIMESTAMP NOT NULL DEFAULT NOW())
+- INDEX(tenant_id, user_id)
+- INDEX(project_id)
+- INDEX(completed)
+- INDEX(due_date)
+- UNIQUE(uuid)
+
+### user_sessions
+- id (BIGSERIAL PRIMARY KEY)
+- user_id (BIGINT NOT NULL REFERENCES users(id))
+- token (VARCHAR(255) NOT NULL UNIQUE)
+- expires_at (TIMESTAMP NOT NULL)
+- created_at (TIMESTAMP NOT NULL DEFAULT NOW())
+- INDEX(token)
+- INDEX(expires_at)
+
+## Row Level Security (RLS)
+All tables will have RLS enabled to ensure users can only access their own data within their tenant.