Add expected guest count on booking

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

@@ -0,0 +1,27 @@
+package com.android.trisolarisserver.config
+
+import org.springframework.jdbc.core.JdbcTemplate
+import org.springframework.stereotype.Component
+
+@Component
+class BookingSchemaFix(
+    private val jdbcTemplate: JdbcTemplate
+) : PostgresSchemaFix(jdbcTemplate) {
+
+    override fun runPostgres(jdbcTemplate: JdbcTemplate) {
+        val hasExpectedGuestCount = jdbcTemplate.queryForObject(
+            """
+            select count(*)
+            from information_schema.columns
+            where table_name = 'booking'
+              and column_name = 'expected_guest_count'
+            """.trimIndent(),
+            Int::class.java
+        ) ?: 0
+
+        if (hasExpectedGuestCount == 0) {
+            logger.info("Adding booking.expected_guest_count column")
+            jdbcTemplate.execute("alter table booking add column expected_guest_count integer")
+        }
+    }
+}