初始提交：文字匹配图片项目

db/split_tables/ai_statistics_monthly.sql

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+-- SQL table definition
+-- Generated from splitting a larger SQL file
+-- Table: ai_statistics_monthly
+--
+
+CREATE TABLE `ai_statistics_monthly` (
+  `id` bigint NOT NULL AUTO_INCREMENT COMMENT '自增主键',
+  `author_id` int NOT NULL DEFAULT '0' COMMENT '作者ID',
+  `author_name` varchar(100) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '作者名称',
+  `channel` tinyint(1) NOT NULL DEFAULT '1' COMMENT '1=baidu|2=toutiao|3=weixin',
+  `stat_monthly` varchar(48) NOT NULL COMMENT '统计日期（自然月）',
+  `monthly_revenue` decimal(18,2) DEFAULT '0.00' COMMENT '当月收益（stat_date所在自然月的总收益）',
+  `revenue_mom_growth_rate` decimal(10,6) DEFAULT '0.000000' COMMENT '收益月环比增长率（(本月收益 - 上月收益) / NULLIF(上月收益, 0)）',
+  `created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+  `updated_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
+  PRIMARY KEY (`id`) USING BTREE,
+  UNIQUE KEY `uk_author_stat_date` (`author_id`,`stat_monthly`) USING BTREE,
+  KEY `idx_stat_date` (`stat_monthly`) USING BTREE,
+  KEY `idx_author_id` (`author_id`) USING BTREE
+) ENGINE=InnoDB AUTO_INCREMENT=41278 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci ROW_FORMAT=DYNAMIC COMMENT='AI内容每月核心指标汇总表（含累计、收益及环比）';