keep better-documented flusurv migration script (#1685)

Author: nmdefries

src/ddl/migrations/flusurv_age_sex_race_strata.sql

@@ -1,23 +1,23 @@
 -- Add new age, race, and sex strata, and season descriptor (YYYY-YY format)
 ALTER TABLE `flusurv` ADD (
-  `rate_age_18t29` double DEFAULT NULL,
-  `rate_age_30t39` double DEFAULT NULL,
-  `rate_age_40t49` double DEFAULT NULL,
-  `rate_age_5t11` double DEFAULT NULL,
-  `rate_age_12t17` double DEFAULT NULL,
-  `rate_age_lt18` double DEFAULT NULL,
-  `rate_age_gte18` double DEFAULT NULL,
-  `rate_race_white` double DEFAULT NULL,
-  `rate_race_black` double DEFAULT NULL,
-  `rate_race_hisp` double DEFAULT NULL,
-  `rate_race_asian` double DEFAULT NULL,
-  `rate_race_natamer` double DEFAULT NULL,
-  `rate_sex_male` double DEFAULT NULL,
-  `rate_sex_female` double DEFAULT NULL,
-  `rate_age_0tlt1` double DEFAULT NULL,
-  `rate_age_1t4` double DEFAULT NULL,
-  `rate_age_gte75` double DEFAULT NULL,
-  `rate_flu_a` double DEFAULT NULL,
-  `rate_flu_b` double DEFAULT NULL,
-  `season` char(7) DEFAULT NULL,
+    `season` char(7) DEFAULT NULL,
+    `rate_age_18t29` double DEFAULT NULL,
+    `rate_age_30t39` double DEFAULT NULL,
+    `rate_age_40t49` double DEFAULT NULL,
+    `rate_age_5t11` double DEFAULT NULL,
+    `rate_age_12t17` double DEFAULT NULL,
+    `rate_age_lt18` double DEFAULT NULL,
+    `rate_age_gte18` double DEFAULT NULL,
+    `rate_age_1t4` double DEFAULT NULL,
+    `rate_age_gte75` double DEFAULT NULL,
+    `rate_age_0tlt1` double DEFAULT NULL,
+    `rate_race_white` double DEFAULT NULL,
+    `rate_race_black` double DEFAULT NULL,
+    `rate_race_hisp` double DEFAULT NULL,
+    `rate_race_asian` double DEFAULT NULL,
+    `rate_race_natamer` double DEFAULT NULL,
+    `rate_sex_male` double DEFAULT NULL,
+    `rate_sex_female` double DEFAULT NULL,
+    `rate_flu_a` double DEFAULT NULL,
+    `rate_flu_b` double DEFAULT NULL
 );