db: enforce unicode on unicode columns to prevent warnings.

rhodecode/lib/jsonalchemy.py

@@ -25,6 +25,7 b' from sqlalchemy import UnicodeText'
 from sqlalchemy.ext.mutable import Mutable
 
 from rhodecode.lib.ext_json import json
+from rhodecode.lib.utils2 import safe_unicode
 
 
 class JsonRaw(unicode):
@@ -56,10 +57,12 b' class JSONEncodedObj(sqlalchemy.types.Ty'
 
     impl = UnicodeText
     safe = True
+    enforce_unicode = True
 
     def __init__(self, *args, **kwargs):
         self.default = kwargs.pop('default', None)
         self.safe = kwargs.pop('safe_json', self.safe)
+        self.enforce_unicode = kwargs.pop('enforce_unicode', self.enforce_unicode)
         self.dialect_map = kwargs.pop('dialect_map', {})
         super(JSONEncodedObj, self).__init__(*args, **kwargs)
 
@@ -73,6 +76,8 b' class JSONEncodedObj(sqlalchemy.types.Ty'
             value = value
         elif value is not None:
             value = json.dumps(value)
+            if self.enforce_unicode:
+                value = safe_unicode(value)
         return value
 
     def process_result_value(self, value, dialect):

rhodecode/model/db.py

@@ -3956,7 +3956,7 b' class _PullRequestBase(BaseModel):'
 
     @revisions.setter
     def revisions(self, val):
-        self._revisions = ':'.join(val)
+        self._revisions = u':'.join(val)
 
     @hybrid_property
     def last_merge_status(self):