Allow rate plan code per room type

src/main/kotlin/com/android/trisolarisserver/config/RatePlanSchemaFix.kt

@@ -0,0 +1,42 @@
+package com.android.trisolarisserver.config
+
+import org.springframework.jdbc.core.JdbcTemplate
+import org.springframework.stereotype.Component
+
+@Component
+class RatePlanSchemaFix(
+    private val jdbcTemplate: JdbcTemplate
+) : PostgresSchemaFix(jdbcTemplate) {
+
+    override fun runPostgres(jdbcTemplate: JdbcTemplate) {
+        val constraints = jdbcTemplate.query(
+            """
+            select tc.constraint_name,
+                   array_agg(kcu.column_name order by kcu.ordinal_position) as cols
+            from information_schema.table_constraints tc
+            join information_schema.key_column_usage kcu
+              on tc.constraint_name = kcu.constraint_name
+             and tc.table_schema = kcu.table_schema
+            where tc.table_name = 'rate_plan'
+              and tc.constraint_type = 'UNIQUE'
+            group by tc.constraint_name
+            """.trimIndent()
+        ) { rs, _ ->
+            rs.getString("constraint_name") to (rs.getArray("cols").array as Array<*>).map { it.toString() }
+        }
+
+        val oldConstraint = constraints.firstOrNull { it.second == listOf("property_id", "code") }
+        if (oldConstraint != null) {
+            logger.info("Dropping old unique constraint on rate_plan(property_id, code)")
+            jdbcTemplate.execute("alter table rate_plan drop constraint if exists ${oldConstraint.first}")
+        }
+
+        val hasNew = constraints.any { it.second == listOf("property_id", "room_type_id", "code") }
+        if (!hasNew) {
+            logger.info("Adding unique constraint on rate_plan(property_id, room_type_id, code)")
+            jdbcTemplate.execute(
+                "alter table rate_plan add constraint rate_plan_property_roomtype_code_key unique (property_id, room_type_id, code)"
+            )
+        }
+    }
+}