As per this comment, MySQL has issues with deviceToken being too long to be indexed:
11:41:13,946 ERROR [org.hibernate.tool.hbm2ddl.SchemaUpdate] (ServerService Thread Pool -- 61) HHH000388: Unsuccessful: create index deviceTokenIndex on Installation (deviceToken)
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11:41:13,946 ERROR [org.hibernate.tool.hbm2ddl.SchemaUpdate] (ServerService Thread Pool -- 61) Specified key was too long; max key length is 767 bytes
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