fix(migrations): change the order of queries for mysql (#3039)

Signed-off-by: Roman Dmytrenko <[email protected]>

config/migrations/mysql/5_namespaces_relationships.up.sql

@@ -1,3 +1,9 @@
+-- Drop previously created foreign key
+ALTER TABLE constraints DROP FOREIGN KEY `constraints_ibfk_1`;
+ALTER TABLE rules DROP FOREIGN KEY `rules_ibfk_1`;
+ALTER TABLE rules DROP FOREIGN KEY `rules_ibfk_2`;
+ALTER TABLE variants DROP FOREIGN KEY `variants_ibfk_1`;
+
 -- Flags
 
 -- Add column namespace_key with a default value
@@ -6,19 +12,18 @@ ALTER TABLE flags ADD COLUMN namespace_key VARCHAR(255) NOT NULL DEFAULT 'defaul
 -- Drop previously created unique index
 ALTER TABLE flags DROP INDEX `key`, ADD INDEX `key` (`key`) USING BTREE;
 
--- Add foreign key constraint on namespace_key column referencing key column of namespaces table
-ALTER TABLE flags ADD FOREIGN KEY (namespace_key) REFERENCES namespaces(`key`) ON DELETE CASCADE;
-
 -- Drop primary key constraint and add a new composite primary key on namespace_key and key columns
 ALTER TABLE flags DROP PRIMARY KEY, ADD PRIMARY KEY (`namespace_key`, `key`);
 
+-- Add foreign key constraint on namespace_key column referencing key column of namespaces table
+ALTER TABLE flags ADD FOREIGN KEY (namespace_key) REFERENCES namespaces(`key`) ON DELETE CASCADE;
+
 -- Variants
 
 -- Add column namespace_key with a default value
 ALTER TABLE variants ADD COLUMN namespace_key VARCHAR(255) NOT NULL DEFAULT 'default';
 
 -- Drop previously created foreign key
-ALTER TABLE variants DROP FOREIGN KEY `variants_ibfk_1`;
 
 -- Drop previously created unique index and add a new unique index on namespace_key, flag_key and key columns
 ALTER TABLE variants DROP INDEX `variants_flag_key_key`, ADD UNIQUE INDEX `variants_namespace_flag_key` (`namespace_key`, `flag_key`, `key`) USING BTREE;
@@ -31,26 +36,23 @@ ALTER TABLE variants ADD FOREIGN KEY (namespace_key, flag_key) REFERENCES flags(
 
 -- Segments
 
--- Add column namespace_key with a default value
-ALTER TABLE segments ADD COLUMN namespace_key VARCHAR(255) NOT NULL DEFAULT 'default';
-
 -- Drop previously created unique index and add a new unique index on namespace_key and key columns
 ALTER TABLE segments DROP INDEX `key`, ADD INDEX `key` (`key`) USING BTREE;
 
--- Add foreign key constraint on namespace_key column referencing key column of namespaces table
-ALTER TABLE segments ADD FOREIGN KEY (namespace_key) REFERENCES namespaces(`key`) ON DELETE CASCADE;
+-- Add column namespace_key with a default value
+ALTER TABLE segments ADD COLUMN namespace_key VARCHAR(255) NOT NULL DEFAULT 'default';
 
 -- Drop primary key constraint and add a new composite primary key on namespace_key and key columns
 ALTER TABLE segments DROP PRIMARY KEY, ADD PRIMARY KEY (`namespace_key`, `key`);
 
+-- Add foreign key constraint on namespace_key column referencing key column of namespaces table
+ALTER TABLE segments ADD FOREIGN KEY (namespace_key) REFERENCES namespaces(`key`) ON DELETE CASCADE;
+
 -- Constraints
 
 -- Add column namespace_key with a default value
 ALTER TABLE constraints ADD COLUMN namespace_key VARCHAR(255) NOT NULL DEFAULT 'default';
 
--- Drop previously created foreign key
-ALTER TABLE constraints DROP FOREIGN KEY `constraints_ibfk_1`;
-
 -- Drop previously created index and add a new index on namespace_key and segment_key columns
 ALTER TABLE constraints DROP INDEX `segment_key`, ADD INDEX `constraints_namespace_segment_key` (`namespace_key`, `segment_key`) USING BTREE;
 
@@ -65,10 +67,6 @@ ALTER TABLE constraints ADD FOREIGN KEY (namespace_key, segment_key) REFERENCES
 -- Add column namespace_key with a default value
 ALTER TABLE rules ADD COLUMN namespace_key VARCHAR(255) NOT NULL DEFAULT 'default';
 
--- Drop previously created foreign keys
-ALTER TABLE rules DROP FOREIGN KEY `rules_ibfk_1`;
-ALTER TABLE rules DROP FOREIGN KEY `rules_ibfk_2`;
-
 -- Drop previously created index and add a new index on namespace_key, flag_key and segment_key columns
 ALTER TABLE rules DROP INDEX `flag_key`, ADD INDEX `rules_namespace_flag_key` (`namespace_key`, `flag_key`) USING BTREE;
 ALTER TABLE rules DROP INDEX `segment_key`, ADD INDEX `rules_namespace_segment_key` (`namespace_key`, `segment_key`) USING BTREE;