Implemented audit log system

api/migrations/sqls/20260212165353-audit-log-down.sql

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+/* Replace with your SQL commands */

api/migrations/sqls/20260212165353-audit-log-up.sql

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+CREATE TABLE audit_log (
+    id INT PRIMARY KEY AUTO_INCREMENT,
+    -- "area.action" (e.g., 'calendarEvent.create', 'member.update_rank')
+    action_type VARCHAR(100) NOT NULL,
+    -- The JSON blob containing detailed information
+    payload JSON DEFAULT NULL,
+    -- Identifying the actor
+    created_by INT,
+    -- The ID of the resource being acted upon
+    target_id INT DEFAULT NULL,
+
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT fk_created_by FOREIGN KEY (created_by) REFERENCES members(id) ON DELETE
+    SET NULL,
+        INDEX idx_action (action_type),
+        INDEX idx_target (target_id)
+);