FTS-1710 Make overwrite_flag a ternary flag in the DB

src/fts3/model/job.py

@@ -45,8 +45,8 @@ class Job(Base):
     max_time_in_queue        = Column(Integer)
     space_token              = Column(String(255))
     internal_job_params      = Column(String(255))
-    overwrite_flag           = Column(Flag)
     dst_file_report          = Column(Flag)
+    overwrite_flag           = Column(TernaryFlag)
     job_finished             = Column(DateTime)
     source_space_token       = Column(String(255))
     copy_pin_lifetime        = Column(Integer)
@@ -92,8 +92,8 @@ class ArchivedJob(Base):
     max_time_in_queue        = Column(Integer)
     space_token              = Column(String(255))
     internal_job_params      = Column(String(255))
-    overwrite_flag           = Column(Flag)
     dst_file_report          = Column(Flag)
+    overwrite_flag           = Column(TernaryFlag)
     job_finished             = Column(DateTime)
     source_space_token       = Column(String(255))
     copy_pin_lifetime        = Column(Integer)

src/fts3rest/fts3rest/lib/JobBuilder.py

@@ -497,7 +497,7 @@ class JobBuilder(object):
         elif self.params['overwrite_on_retry']:
             overwrite_flag = 'R'
         else:
-            overwrite_flag = None
+            overwrite_flag = False
 
         self.job = dict(
             job_id=self.job_id,