create a separate params table for immutable jobs fields

backend/migrations/20240930091039_create_job_params_table.down.sql

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+DROP TABLE job_params;

backend/migrations/20240930091039_create_job_params_table.up.sql

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+-- Add up migration script here
+-- Add down migration script here
+
+CREATE TABLE job_params (
+  id UUID PRIMARY KEY,
+  args JSONB,
+  raw_code TEXT,
+  raw_flow jsonb NULL
+);