Add Customer users

migrations/000028_create_ingredient_compositions_table.up.sql

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+-- Ingredient compositions table
+CREATE TABLE ingredient_compositions (
+    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,
+    parent_ingredient_id UUID NOT NULL REFERENCES ingredients(id) ON DELETE CASCADE,
+    child_ingredient_id UUID NOT NULL REFERENCES ingredients(id) ON DELETE CASCADE,
+    quantity DECIMAL(12,3) NOT NULL,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+
+-- Indexes
+CREATE INDEX idx_ingredient_compositions_organization_id ON ingredient_compositions(organization_id);
+CREATE INDEX idx_ingredient_compositions_outlet_id ON ingredient_compositions(outlet_id);
+CREATE INDEX idx_ingredient_compositions_parent_ingredient_id ON ingredient_compositions(parent_ingredient_id);
+CREATE INDEX idx_ingredient_compositions_child_ingredient_id ON ingredient_compositions(child_ingredient_id);
+CREATE INDEX idx_ingredient_compositions_created_at ON ingredient_compositions(created_at);
+
+-- Unique constraint to prevent duplicate compositions
+CREATE UNIQUE INDEX idx_ingredient_compositions_unique ON ingredient_compositions(parent_ingredient_id, child_ingredient_id);