db: reduce size of fingerprint column for mysql compat.

- we can get into troubles by having long fingerprint under mysql
because we do an index on this column.

rhodecode/lib/dbmigrate/schema/db_4_9_0_0.py

@@ -1158,7 +1158,7 b' class UserSshKeys(Base, BaseModel):'
 
     ssh_key_id = Column('ssh_key_id', Integer(), nullable=False, unique=True, default=None, primary_key=True)
     ssh_key_data = Column('ssh_key_data', String(10240), nullable=False, unique=None, default=None)
-    ssh_key_fingerprint = Column('ssh_key_fingerprint', String(1024), nullable=False, unique=None, default=None)
+    ssh_key_fingerprint = Column('ssh_key_fingerprint', String(255), nullable=False, unique=None, default=None)
 
     description = Column('description', UnicodeText().with_variant(UnicodeText(1024), 'mysql'))
 

rhodecode/model/db.py

@@ -1207,7 +1207,7 b' class UserSshKeys(Base, BaseModel):'
 
     ssh_key_id = Column('ssh_key_id', Integer(), nullable=False, unique=True, default=None, primary_key=True)
     ssh_key_data = Column('ssh_key_data', String(10240), nullable=False, unique=None, default=None)
-    ssh_key_fingerprint = Column('ssh_key_fingerprint', String(1024), nullable=False, unique=None, default=None)
+    ssh_key_fingerprint = Column('ssh_key_fingerprint', String(255), nullable=False, unique=None, default=None)
 
     description = Column('description', UnicodeText().with_variant(UnicodeText(1024), 'mysql'))