diff --git a/message_report/db_init.sql b/message_report/db_init.sql
index 893c9d7..75cb6d9 100644
--- a/message_report/db_init.sql
+++ b/message_report/db_init.sql
@@ -1,9 +1,15 @@
-CREATE TABLE IF NOT EXISTS speech_counts
-(
-    group_id TEXT,
-    wx_id    TEXT,
-    date     TEXT,
-    count    INTEGER,
-    PRIMARY KEY (group_id, wx_id, date)
-)
+
+USE message_archive;
+-- auto-generated definition
+create table speech_counts
+(
+    id       int auto_increment
+        primary key,
+    group_id text null,
+    wx_id    text null,
+    date     text null,
+    count    int  null,
+    constraint speech_counts_group_id_wx_id_date_uindex
+        unique (group_id, wx_id, date) using hash
+);
 
diff --git a/message_stats.db b/message_stats.db
deleted file mode 100644
index 2a9ee6a..0000000
Binary files a/message_stats.db and /dev/null differ