chore: [CODE-3779]: add index for migrations table (#3742)

app/store/database/migrate/postgres/0000_alter_table_migrations.up.sql

@@ -0,0 +1,2 @@
+-- primary key is required by some database tools and dependencies.
+ALTER TABLE migrations ADD PRIMARY KEY (version);

app/store/database/migrate/sqlite/0000_alter_table_migrations.up.sql

@@ -0,0 +1,16 @@
+-- primary key is required by some database tools and dependencies.
+-- 1. Create a new table with primary key
+CREATE TABLE migrations_with_primary_key (
+  version TEXT PRIMARY KEY
+);
+
+-- 2. Copy data (without this step, the new migration table would be empty after startup on a fresh db)
+INSERT INTO migrations_with_primary_key(version)
+SELECT version
+FROM migrations;
+
+-- 3. Drop the old table
+DROP TABLE migrations;
+
+-- 4. Rename the new table
+ALTER TABLE migrations_with_primary_key RENAME TO migrations;