For GitHub push (#9)

fix: change db

Author: jianggang

src/main/resources/db/migration/V8__add_segment_fields.sql

@@ -0,0 +1,4 @@
+alter table segment
+    add unique_key varchar(1024) not null;
+
+UPDATE segment SET unique_key = concat(concat(project_key, '$'), `key`)

src/main/resources/db/migration/V9__add_targeting_version_table.sql

@@ -0,0 +1,15 @@
+create table targeting_version
+(
+    id             int auto_increment primary key,
+    targeting_id   bigint            not null,
+    project_key    varchar(128)      not null,
+    environment_key varchar(128)      not null,
+    comment        varchar(1024)     not null,
+    content        text              not null,
+    version        bigint            not null,
+    deleted        tinyint default 0 not null,
+    modified_time  datetime          not null,
+    created_by     varchar(32)       not null,
+    created_time   datetime          not null,
+    modified_by    varchar(32)       not null
+) collate = utf8mb4_unicode_ci;