Add Customer users

migrations/000026_create_units_table.up.sql

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+-- Units table
+CREATE TABLE units (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    organization_id UUID NOT NULL REFERENCES organizations(id) ON DELETE CASCADE,
+    outlet_id UUID REFERENCES outlets(id) ON DELETE CASCADE,
+    name VARCHAR(50) NOT NULL,
+    abbreviation VARCHAR(10),
+    is_active BOOLEAN DEFAULT true,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+
+-- Indexes
+CREATE INDEX idx_units_organization_id ON units(organization_id);
+CREATE INDEX idx_units_outlet_id ON units(outlet_id);
+CREATE INDEX idx_units_is_active ON units(is_active);
+CREATE INDEX idx_units_created_at ON units(created_at);