Clean up read-only props in datamodel (SYN-4663)

[Cisphyx]

No description provided.

[codecov]

Codecov Report

Base: 97.18% // Head: 97.08% // Decreases project coverage by -0.11% ⚠️

Coverage data is based on head (7a35362) compared to base (3539624).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3005      +/-   ##
==========================================
- Coverage   97.18%   97.08%   -0.11%     
==========================================
  Files         218      218              
  Lines       43171    43171              
==========================================
- Hits        41957    41912      -45     
- Misses       1214     1259      +45     

Flag	Coverage Δ
linux	97.08% <ø> (ø)
linux_replay	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
synapse/models/dns.py	100.00% <ø> (ø)
synapse/tests/utils.py	94.46% <0.00%> (-1.89%)	⬇️
synapse/cortex.py	96.72% <0.00%> (-0.56%)	⬇️
synapse/lib/hiveauth.py	96.01% <0.00%> (-0.48%)	⬇️
synapse/lib/oauth.py	98.68% <0.00%> (-0.44%)	⬇️
synapse/lib/trigger.py	95.01% <0.00%> (-0.39%)	⬇️
synapse/lib/view.py	97.01% <0.00%> (-0.34%)	⬇️
synapse/lib/jsonstor.py	98.32% <0.00%> (-0.24%)	⬇️
synapse/axon.py	98.73% <0.00%> (-0.15%)	⬇️
synapse/lib/layer.py	96.59% <0.00%> (-0.05%)	⬇️

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