使用flyway管理数据库版本

错误信息：
Invocation of init method failed; nested exception is org.flywaydb.core.api.FlywayException: Found non-empty schema(s) `markov_demo` but no schema history table. Use baseline() or set baselineOnMigrate to true to initialize the schema history table.

修改意见：

application.properties
```
spring.flyway.default-schema=markov_demo
spring.flyway.locations=classpath:db/migration
```
修改为
```
spring.flyway.default-schema=markov_demo
spring.flyway.locations=classpath:db/migration
spring.flyway.baseline-on-migrate=true
```

Open application.properties and inspect the Spring Flyway settings, starting with the reported startup error about the non-empty markov_demo schema and missing schema history table. Confirm that enabling baseline-on-migrate allows startup and initializes the migration history for the existing schema.

Written by the indexing model from the issue text.