The Multi-Tenant Nightmare: Shared vs. Isolated Databases in Laravel

The Hardest Decision in B2B SaaS When you build a B2C application, data is simple: every user has their own data. But when you build a B2B SaaS platform (like an inventory system for different companies), you enter the complex world of Multi-Tenancy. You have Company A and Company B using the same application. The absolute worst-case scenario in SaaS is Company A accidentally seeing Company B's financial data. Preventing this data leakage is the most critical architectural decision you will make, and you have to choose between two fundamentally different database strategies. Strategy 1: The Shared Database (Global Scopes) The most common approach is throwing everyone into the same database and adding a tenant_id column to every single table. In Laravel, you enforce this using Global Scopes. Every time a developer queries the invoices table, Laravel automatically appends WHERE tenant_id = 1 behind the scenes. // Inside an Eloquent Model protected static function booted() { static::addGl