diff --git a/20230324233151_inflections_index.down.sql b/20230324233151_inflections_index.down.sql
new file mode 100644
index 0000000..19f67e1
--- /dev/null
+++ b/20230324233151_inflections_index.down.sql
@@ -0,0 +1 @@
+ALTER TABLE inflections DROP COLUMN index;
diff --git a/20230324233151_inflections_index.up.sql b/20230324233151_inflections_index.up.sql
new file mode 100644
index 0000000..52bf39d
--- /dev/null
+++ b/20230324233151_inflections_index.up.sql
@@ -0,0 +1 @@
+ALTER TABLE inflections ADD COLUMN index BIGINT;
diff --git a/20230324233457_inflections_index_notnull_positive.down.sql b/20230324233457_inflections_index_notnull_positive.down.sql
new file mode 100644
index 0000000..cecdc67
--- /dev/null
+++ b/20230324233457_inflections_index_notnull_positive.down.sql
@@ -0,0 +1,5 @@
+BEGIN;
+ALTER TABLE inflections ALTER COLUMN index DROP NOT NULL;
+ALTER TABLE inflections DROP CONSTRAINT index_is_not_negative;
+DROP INDEX inflections_part_id_index;
+COMMIT;
diff --git a/20230324233457_inflections_index_notnull_positive.up.sql b/20230324233457_inflections_index_notnull_positive.up.sql
new file mode 100644
index 0000000..801ee15
--- /dev/null
+++ b/20230324233457_inflections_index_notnull_positive.up.sql
@@ -0,0 +1,5 @@
+BEGIN;
+ALTER TABLE inflections ALTER COLUMN index SET NOT NULL;
+ALTER TABLE inflections ADD CONSTRAINT index_is_not_negative CHECK (index >= 0);
+CREATE UNIQUE INDEX inflections_part_id_index ON inflections (part_id, index);
+COMMIT;