Add Updated At to Tasks And Libraries

migrations/000005_alter_task_table_updated_at.down.sql

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+ALTER TABLE tasks
+DROP updated_at;

migrations/000005_alter_task_table_updated_at.up.sql

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+ALTER TABLE tasks
+ADD updated_at TIMESTAMP NOT NULL DEFAULT current_timestamp;

migrations/000006_create_function_update_updated_at_column.down.sql

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+DROP FUNCTION update_updated_at_column;

migrations/000006_create_function_update_updated_at_column.up.sql

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+CREATE OR REPLACE FUNCTION update_updated_at_column()   
+RETURNS TRIGGER AS $$
+BEGIN
+    NEW.updated_at = clock_timestamp();
+    RETURN NEW;   
+END;
+$$ language 'plpgsql';

migrations/000007_create_trigger_update_task_timestamp.down.sql

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+DROP TRIGGER update_tasks_timestamp;

migrations/000007_create_trigger_update_task_timestamp.up.sql

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+CREATE TRIGGER update_tasks_timestamp BEFORE UPDATE ON tasks FOR EACH ROW EXECUTE PROCEDURE  update_updated_at_column();

migrations/000008_alter_files_table_updated_at.down.sql

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+ALTER TABLE files
+DROP updated_at;

migrations/000008_alter_files_table_updated_at.up.sql

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+ALTER TABLE files
+ADD updated_at TIMESTAMP NOT NULL DEFAULT current_timestamp;

migrations/000009_create_trigger_update_files_timestamp.down.sql

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+DROP TRIGGER update_files_timestamp;

migrations/000009_create_trigger_update_files_timestamp.up.sql

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+CREATE TRIGGER update_files_timestamp BEFORE UPDATE ON files FOR EACH ROW EXECUTE PROCEDURE  update_updated_at_column();