fix: Add migration SQL files to repository

migrations/001_create_audit_logs.sql

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+-- Migration: Create audit_logs table
+-- Description: Audit log untuk tracking semua perubahan data (create/update/delete)
+-- Date: 2024-12-28
+
+CREATE TABLE IF NOT EXISTS audit_logs (
+    id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    actor_user_id INT UNSIGNED NOT NULL,
+    actor_username VARCHAR(100) NOT NULL,
+    actor_role VARCHAR(50) NOT NULL,
+    action VARCHAR(20) NOT NULL COMMENT 'create|update|delete',
+    entity VARCHAR(50) NOT NULL COMMENT 'locations|gates|tariffs',
+    entity_key VARCHAR(255) NOT NULL COMMENT 'Primary key atau composite key (e.g., "kerkof_01" or "kerkof_01:gate01")',
+    before_json JSON NULL COMMENT 'Data sebelum perubahan (untuk update/delete)',
+    after_json JSON NULL COMMENT 'Data sesudah perubahan (untuk create/update)',
+    ip_address VARCHAR(45) NOT NULL COMMENT 'IPv4 atau IPv6',
+    user_agent VARCHAR(500) NULL,
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    INDEX idx_actor_user_id (actor_user_id),
+    INDEX idx_entity (entity, entity_key),
+    INDEX idx_action (action),
+    INDEX idx_created_at (created_at)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+

migrations/002_create_hourly_summary.sql

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+-- Migration: Create hourly_summary table
+-- Description: Rekap per jam untuk kebutuhan grafik dashboard
+-- Date: 2024-12-28
+
+CREATE TABLE IF NOT EXISTS hourly_summary (
+    summary_date DATE NOT NULL,
+    summary_hour TINYINT UNSIGNED NOT NULL COMMENT '0-23',
+    location_code VARCHAR(64) NOT NULL,
+    gate_code VARCHAR(64) NOT NULL,
+    category VARCHAR(64) NOT NULL,
+    total_count INT UNSIGNED NOT NULL DEFAULT 0,
+    total_amount BIGINT UNSIGNED NOT NULL DEFAULT 0,
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    PRIMARY KEY (summary_date, summary_hour, location_code, gate_code, category),
+    INDEX idx_summary_date_location (summary_date, location_code),
+    INDEX idx_summary_date_hour (summary_date, summary_hour)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+

migrations/003_create_realtime_events.sql

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+-- Migration: Create realtime_events table
+-- Description: Ring buffer untuk realtime stream & SSE events
+-- Date: 2024-12-28
+
+CREATE TABLE IF NOT EXISTS realtime_events (
+    id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    location_code VARCHAR(64) NOT NULL,
+    gate_code VARCHAR(64) NOT NULL,
+    category VARCHAR(64) NOT NULL,
+    event_time INT UNSIGNED NOT NULL COMMENT 'Unix timestamp',
+    total_count_delta INT NOT NULL DEFAULT 1 COMMENT 'Delta count untuk event ini (biasanya 1)',
+    INDEX idx_created_at (created_at),
+    INDEX idx_location_gate (location_code, gate_code)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- Optional: Cleanup old events (older than 7 days) via cron or manual
+-- DELETE FROM realtime_events WHERE created_at < DATE_SUB(NOW(), INTERVAL 7 DAY);
+