Tipos de toma backend logic

water-api/sql/create_meter_types.sql

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+-- ============================================================================
+-- Create meter_types table and add relationship to projects
+-- Meter types: LoRa, LoRaWAN, Grandes Consumidores
+-- ============================================================================
+
+-- Create meter_types table
+CREATE TABLE IF NOT EXISTS meter_types (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  name VARCHAR(50) NOT NULL UNIQUE,
+  code VARCHAR(20) NOT NULL UNIQUE,
+  description TEXT,
+  is_active BOOLEAN DEFAULT true,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Insert default meter types
+INSERT INTO meter_types (name, code, description) VALUES
+  ('LoRa', 'LORA', 'Medidores con tecnología LoRa'),
+  ('LoRaWAN', 'LORAWAN', 'Medidores con tecnología LoRaWAN'),
+  ('Grandes Consumidores', 'GRANDES', 'Medidores para grandes consumidores')
+ON CONFLICT (code) DO NOTHING;
+
+-- Add meter_type_id column to projects table
+ALTER TABLE projects 
+ADD COLUMN IF NOT EXISTS meter_type_id UUID REFERENCES meter_types(id) ON DELETE SET NULL;
+
+-- Add index for better query performance
+CREATE INDEX IF NOT EXISTS idx_projects_meter_type_id ON projects(meter_type_id);
+
+-- Add comment
+COMMENT ON TABLE meter_types IS 'Catalog of meter types (LoRa, LoRaWAN, Grandes Consumidores)';
+COMMENT ON COLUMN projects.meter_type_id IS 'Default meter type for this project';
+
+-- ============================================================================
+-- Helper function to get meter type by code
+-- ============================================================================
+
+CREATE OR REPLACE FUNCTION get_meter_type_id(type_code VARCHAR)
+RETURNS UUID AS $$
+DECLARE
+  type_id UUID;
+BEGIN
+  SELECT id INTO type_id FROM meter_types WHERE code = type_code AND is_active = true;
+  RETURN type_id;
+END;
+$$ LANGUAGE plpgsql;
+
+-- ============================================================================
+-- Update trigger for updated_at
+-- ============================================================================
+
+CREATE OR REPLACE FUNCTION update_meter_types_updated_at()
+RETURNS TRIGGER AS $$
+BEGIN
+  NEW.updated_at = CURRENT_TIMESTAMP;
+  RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trigger_meter_types_updated_at
+  BEFORE UPDATE ON meter_types
+  FOR EACH ROW
+  EXECUTE FUNCTION update_meter_types_updated_at();
+
+-- ============================================================================
+-- Verify the changes
+-- ============================================================================
+
+-- Show meter types
+SELECT id, name, code, description, is_active FROM meter_types ORDER BY code;
+
+-- Show projects table structure
+SELECT 
+    column_name, 
+    data_type, 
+    is_nullable,
+    column_default
+FROM information_schema.columns 
+WHERE table_name = 'projects' 
+  AND column_name = 'meter_type_id';