Add coa purchase and vendors

migrations/000039_create_vendors_table.up.sql

@@ -0,0 +1,22 @@
+-- Vendors table
+CREATE TABLE vendors (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    organization_id UUID NOT NULL REFERENCES organizations(id) ON DELETE CASCADE,
+    name VARCHAR(255) NOT NULL,
+    email VARCHAR(255),
+    phone_number VARCHAR(20),
+    address TEXT,
+    contact_person VARCHAR(255),
+    tax_number VARCHAR(50),
+    payment_terms VARCHAR(100),
+    notes TEXT,
+    is_active BOOLEAN NOT NULL DEFAULT true,
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+
+CREATE INDEX idx_vendors_organization_id ON vendors(organization_id);
+CREATE INDEX idx_vendors_name ON vendors(name);
+CREATE INDEX idx_vendors_email ON vendors(email);
+CREATE INDEX idx_vendors_is_active ON vendors(is_active);
+CREATE INDEX idx_vendors_created_at ON vendors(created_at);