(Feat): Initial Commit

backend/database/migrations/add_contractor_rates_columns.sql

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+-- Migration: Add sub_department_id and activity columns to contractor_rates table
+-- Run this if you have an existing database
+
+-- Add sub_department_id column if it doesn't exist
+ALTER TABLE contractor_rates 
+ADD COLUMN IF NOT EXISTS sub_department_id INT NULL,
+ADD COLUMN IF NOT EXISTS activity VARCHAR(200) NULL;
+
+-- Add foreign key constraint for sub_department_id
+-- Note: This may fail if the constraint already exists
+ALTER TABLE contractor_rates 
+ADD CONSTRAINT fk_contractor_rates_sub_department 
+FOREIGN KEY (sub_department_id) REFERENCES sub_departments(id) ON DELETE SET NULL;