Revert "Update SQLAlchemy, Flask, Flask-SQLAlchemy, and other packages to current versions. #5901"

This reverts commit 31818bb67a.

web/pgadmin/model/__init__.py

@@ -73,6 +73,25 @@ class PgAdminDbBinaryString(types.TypeDecorator):
             return value
 
 
+class PgAdminJSONString(types.TypeDecorator):
+    """
+    This function is used to return a string representing a json object from
+    an object and vise versa.
+    """
+
+    impl = types.String
+
+    def process_bind_param(self, value, dialect):
+        if value is not None:
+            value = json.dumps(value)
+        return value
+
+    def process_result_value(self, value, dialect):
+        if value is not None:
+            value = json.loads(value)
+        return value
+
+
 class Version(db.Model):
     """Version numbers for reference/upgrade purposes"""
     __tablename__ = 'version'
@@ -199,7 +218,7 @@ class Server(db.Model):
     shared = db.Column(db.Boolean(), nullable=False)
     kerberos_conn = db.Column(db.Boolean(), nullable=False, default=0)
     cloud_status = db.Column(db.Integer(), nullable=False, default=0)
-    connection_params = db.Column(MutableDict.as_mutable(types.JSON))
+    connection_params = db.Column(MutableDict.as_mutable(PgAdminJSONString))
 
     @property
     def serialize(self):
@@ -439,7 +458,7 @@ class SharedServer(db.Model):
     tunnel_identity_file = db.Column(db.String(64), nullable=True)
     tunnel_password = db.Column(PgAdminDbBinaryString())
     shared = db.Column(db.Boolean(), nullable=False)
-    connection_params = db.Column(MutableDict.as_mutable(types.JSON))
+    connection_params = db.Column(MutableDict.as_mutable(PgAdminJSONString))
 
 
 class Macros(db.Model):