Primer version funcional

database/migration_add_total_amount_to_concepts.sql

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+-- Migration to add total_amount to finance_collection_concepts table
+ALTER TABLE `finance_collection_concepts`
+ADD COLUMN `total_amount` DECIMAL(10, 2) NULL DEFAULT NULL AFTER `description`;

database/migration_create_expense_concept_allocations_table.sql

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+-- Migration to create expense_concept_allocations table
+CREATE TABLE `expense_concept_allocations` (
+    `id` INT AUTO_INCREMENT PRIMARY KEY,
+    `expense_id` INT NOT NULL,
+    `concept_id` INT NOT NULL,
+    `amount` DECIMAL(10, 2) NOT NULL,
+    `created_at` DATETIME DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (`expense_id`) REFERENCES `expenses`(`id`) ON DELETE CASCADE,
+    FOREIGN KEY (`concept_id`) REFERENCES `finance_collection_concepts`(`id`) ON DELETE CASCADE,
+    UNIQUE KEY `unique_expense_concept_allocation` (`expense_id`, `concept_id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

database/migration_expense_concepts.sql

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+-- Migración para relacionar gastos con conceptos globales
+-- Permite que un gasto se asocie a uno o varios conceptos globales
+-- Esto permite calcular el balance correcto por concepto: (Recaudado - Gastado)
+
+-- Tabla de relación muchos-a-muchos: gastos <-> conceptos globales
+CREATE TABLE IF NOT EXISTS `expense_concept_collections` (
+    `id` INT AUTO_INCREMENT PRIMARY KEY,
+    `expense_id` INT NOT NULL,
+    `concept_id` INT NOT NULL,
+    `amount` DECIMAL(10,2) NOT NULL COMMENT 'Monto del gasto asignado a este concepto',
+    `created_at` DATETIME DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (`expense_id`) REFERENCES `expenses`(`id`) ON DELETE CASCADE,
+    FOREIGN KEY (`concept_id`) REFERENCES `finance_collection_concepts`(`id`) ON DELETE CASCADE,
+    UNIQUE KEY `unique_expense_concept` (`expense_id`, `concept_id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- Índice para optimizar consultas
+CREATE INDEX idx_expense_concept_expense ON expense_concept_collections(expense_id);
+CREATE INDEX idx_expense_concept_concept ON expense_concept_collections(concept_id);