diff --git a/store/migration/mysql/dev/LATEST.sql b/store/migration/mysql/dev/LATEST.sql
index 3a3fb7d0..4191e7dc 100644
--- a/store/migration/mysql/dev/LATEST.sql
+++ b/store/migration/mysql/dev/LATEST.sql
@@ -127,6 +127,6 @@ CREATE TABLE `reaction` (
   `created_ts` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
   `creator_id` INT NOT NULL,
   `content_id` VARCHAR(256) NOT NULL,
-  `reaction_type` VARCHAR(256) NOT NULL,
+  `reaction_type` TINYTEXT NOT NULL,
   UNIQUE(`creator_id`,`content_id`,`reaction_type`)  
 );
diff --git a/store/migration/mysql/prod/0.23/00__reactions.sql b/store/migration/mysql/prod/0.23/00__reactions.sql
index 13979d15..8220ad0d 100644
--- a/store/migration/mysql/prod/0.23/00__reactions.sql
+++ b/store/migration/mysql/prod/0.23/00__reactions.sql
@@ -1,3 +1,7 @@
+-- modify reaction_type to be a TINYTEXT instead of varchar(256).
+ALTER TABLE `reaction` MODIFY `reaction_type` TINYTEXT NOT NULL;
+
+-- update reaction_type to emoji.
 UPDATE `reaction` SET `reaction_type` = '👍' WHERE `reaction_type` = 'THUMBS_UP';
 UPDATE `reaction` SET `reaction_type` = '👎' WHERE `reaction_type` = 'THUMBS_DOWN';
 UPDATE `reaction` SET `reaction_type` = '💛' WHERE `reaction_type` = 'HEART';
diff --git a/store/migration/mysql/prod/LATEST.sql b/store/migration/mysql/prod/LATEST.sql
index 3a3fb7d0..4191e7dc 100644
--- a/store/migration/mysql/prod/LATEST.sql
+++ b/store/migration/mysql/prod/LATEST.sql
@@ -127,6 +127,6 @@ CREATE TABLE `reaction` (
   `created_ts` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
   `creator_id` INT NOT NULL,
   `content_id` VARCHAR(256) NOT NULL,
-  `reaction_type` VARCHAR(256) NOT NULL,
+  `reaction_type` TINYTEXT NOT NULL,
   UNIQUE(`creator_id`,`content_id`,`reaction_type`)  
 );