diff --git a/_sql/migrations/2023-02-03-035217_unsubscribe_reason_table/down.sql b/_sql/migrations/2023-02-03-035217_unsubscribe_reason_table/down.sql
index dd1062b2d5..97a5f2746b 100644
--- a/_sql/migrations/2023-02-03-035217_unsubscribe_reason_table/down.sql
+++ b/_sql/migrations/2023-02-03-035217_unsubscribe_reason_table/down.sql
@@ -1,2 +1,6 @@
+-- noinspection SqlDialectInspectionForFile
+-- noinspection SqlNoDataSourceInspectionForFile
+-- noinspection SqlResolveForFile
+
 -- This file should undo anything in `up.sql`
 drop table unsubscribe_reason;
diff --git a/_sql/migrations/2023-02-03-035217_unsubscribe_reason_table/up.sql b/_sql/migrations/2023-02-03-035217_unsubscribe_reason_table/up.sql
index 1cda70145b..0755b4629f 100644
--- a/_sql/migrations/2023-02-03-035217_unsubscribe_reason_table/up.sql
+++ b/_sql/migrations/2023-02-03-035217_unsubscribe_reason_table/up.sql
@@ -1,3 +1,7 @@
+-- noinspection SqlDialectInspectionForFile
+-- noinspection SqlNoDataSourceInspectionForFile
+-- noinspection SqlResolveForFile
+
 CREATE TABLE unsubscribe_reason (
     -- Generic primary key
     id BIGINT(20) NOT NULL AUTO_INCREMENT,
diff --git a/_sql/migrations/2023-03-11-042808_alter_tts_models_add_mel_multiply_factor/down.sql b/_sql/migrations/2023-03-11-042808_alter_tts_models_add_mel_multiply_factor/down.sql
new file mode 100644
index 0000000000..17eb1d31ec
--- /dev/null
+++ b/_sql/migrations/2023-03-11-042808_alter_tts_models_add_mel_multiply_factor/down.sql
@@ -0,0 +1,6 @@
+-- noinspection SqlDialectInspectionForFile
+-- noinspection SqlNoDataSourceInspectionForFile
+-- noinspection SqlResolveForFile
+
+ALTER TABLE tts_models DROP COLUMN maybe_custom_mel_multiply_factor;
+ALTER TABLE tts_models DROP COLUMN use_default_mel_multiply_factor;
diff --git a/_sql/migrations/2023-03-11-042808_alter_tts_models_add_mel_multiply_factor/up.sql b/_sql/migrations/2023-03-11-042808_alter_tts_models_add_mel_multiply_factor/up.sql
new file mode 100644
index 0000000000..a161b92aaa
--- /dev/null
+++ b/_sql/migrations/2023-03-11-042808_alter_tts_models_add_mel_multiply_factor/up.sql
@@ -0,0 +1,15 @@
+-- noinspection SqlDialectInspectionForFile
+-- noinspection SqlNoDataSourceInspectionForFile
+-- noinspection SqlResolveForFile
+
+-- If true, multiply the mel outputs before being vocoded by a globally default constant.
+ALTER TABLE tts_models
+    ADD COLUMN use_default_mel_multiply_factor BOOLEAN NOT NULL DEFAULT FALSE
+    AFTER text_preprocessing_algorithm;
+
+-- If not null, multiply the mel outputs before being vocoded by this value.
+-- This is used instead of the default if `use_default_mel_multiply_factor` is
+-- set (ie. `use_default_mel_multiply_factor` is ignored and this custom value is used instead)
+ALTER TABLE tts_models
+    ADD COLUMN maybe_custom_mel_multiply_factor DOUBLE DEFAULT NULL
+    AFTER use_default_mel_multiply_factor;
diff --git a/_sql/migrations_squashed/tts_tables/tts_models.sql b/_sql/migrations_squashed/tts_tables/tts_models.sql
index add0c2c4d9..9098eab8d0 100644
--- a/_sql/migrations_squashed/tts_tables/tts_models.sql
+++ b/_sql/migrations_squashed/tts_tables/tts_models.sql
@@ -49,6 +49,14 @@ CREATE TABLE tts_models (
       'arpabet'
   ) NOT NULL DEFAULT 'basic',
 
+  -- If true, multiply the mel outputs before being vocoded by a globally default constant.
+  use_default_mel_multiply_factor BOOLEAN NOT NULL DEFAULT FALSE,
+
+  -- If not null, multiply the mel outputs before being vocoded by this value.
+  -- This is used instead of the default if `use_default_mel_multiply_factor` is
+  -- set (ie. `use_default_mel_multiply_factor` is ignored and this custom value is used instead)
+  maybe_custom_mel_multiply_factor DOUBLE DEFAULT NULL,
+
   -- If set, use a different pretrained vocoder.
   -- If not set, use the website default. (Currently HifiGan-SS)
   maybe_default_pretrained_vocoder VARCHAR(64) DEFAULT NULL,