[Closes #487] Feature/move trial data to benchmark

src/backend/db/migrations/5_trial_data_belongs_to_benchmark.sql

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+-- Step 1: Add new benchmark_id column to trial_data
+ALTER TABLE trial_data
+ADD COLUMN benchmark_id uuid REFERENCES benchmark(benchmark_id);
+
+-- Step 1a: Add due_date and trial_count to benchmark
+
+ALTER TABLE benchmark
+ADD COLUMN due_date TIMESTAMPTZ;
+
+ALTER TABLE benchmark
+ADD COLUMN trial_count INTEGER;
+
+-- Step 2: Copy benchmark_id from tasks for existing records
+UPDATE trial_data
+SET benchmark_id = task.benchmark_id
+FROM task
+WHERE trial_data.task_id = task.task_id;
+
+-- Step 2a: Copy due_date and trial_count from tasks for existing records
+-- Taking the first result of tasks that matches the right benchmark_id
+
+UPDATE benchmark
+SET due_date = task.due_date, trial_count = task.trial_count
+FROM task
+WHERE task.benchmark_id = benchmark.benchmark_id;
+
+-- Step 3: Make benchmark_id required
+ALTER TABLE trial_data
+ALTER COLUMN benchmark_id SET NOT NULL;
+
+-- Step 4: Remove task_id column
+ALTER TABLE trial_data
+DROP COLUMN task_id;
+
+-- Step 4a: Remove due_date, and trial_count from task
+
+ALTER TABLE task
+DROP COLUMN due_date;
+
+ALTER TABLE task
+DROP COLUMN trial_count;