Daily queue depth per ledger state. The ledger holds current state only, so a row that passed through a state in an hour leaves no depth trace and the dashboard trend charts have nothing to read. Aggregates only, deliberately: anything per-person belongs in the ledger. Roughly sixteen rows a day, so no retention policy is needed.
| Name | Type | Default | Nullable | Children | Parents | Comment |
|---|---|---|---|---|---|---|
| count | integer | false | End-of-day depth in this state. | |||
| created_at | timestamp with time zone | now() | false | Timestamp when the record was created. | ||
| deleted_at | timestamp with time zone | true | Timestamp when the record was deleted. If null, the record is not deleted. | |||
| entered_count | integer | 0 | false | How many rows entered this state that day, from the event table. Makes the funnel flow columns cheap. | ||
| id | uuid | uuid_generate_v4() | false | A unique, stable identifier for the record. | ||
| left_count | integer | 0 | false | How many rows left this state that day, from the event table. | ||
| snapshot_date | date | false | The day this row describes. | |||
| state | credit_registration_state | false | The ledger state this row counts. | |||
| updated_at | timestamp with time zone | now() | false | Timestamp when the record was last updated. The field is updated automatically by the set_timestamp trigger. |
| Name | Definition |
|---|---|
| Credit registration | How a completed course module becomes a credit in the University of Helsinki study registry. Enrolment on the course is itself the student’s consent to register the credit; once a student number is proven to be theirs, one ledger row per completion is pushed to Sisu through Suotar and polled until the registry confirms the attainment. |
| Name | Type | Definition |
|---|---|---|
| credit_registration_daily_snapshots_count_not_null | n | NOT NULL count |
| credit_registration_daily_snapshots_created_at_not_null | n | NOT NULL created_at |
| credit_registration_daily_snapshots_entered_count_not_null | n | NOT NULL entered_count |
| credit_registration_daily_snapshots_id_not_null | n | NOT NULL id |
| credit_registration_daily_snapshots_left_count_not_null | n | NOT NULL left_count |
| credit_registration_daily_snapshots_pkey | PRIMARY KEY | PRIMARY KEY (id) |
| credit_registration_daily_snapshots_snapshot_date_not_null | n | NOT NULL snapshot_date |
| credit_registration_daily_snapshots_state_not_null | n | NOT NULL state |
| credit_registration_daily_snapshots_updated_at_not_null | n | NOT NULL updated_at |
| Name | Definition |
|---|---|
| credit_registration_daily_snapshots_pkey | CREATE UNIQUE INDEX credit_registration_daily_snapshots_pkey ON public.credit_registration_daily_snapshots USING btree (id) |
| uq_credit_registration_daily_snapshots | CREATE UNIQUE INDEX uq_credit_registration_daily_snapshots ON public.credit_registration_daily_snapshots USING btree (snapshot_date, state, deleted_at) NULLS NOT DISTINCT |
| Name | Definition |
|---|---|
| set_timestamp | CREATE TRIGGER set_timestamp BEFORE UPDATE ON public.credit_registration_daily_snapshots FOR EACH ROW EXECUTE FUNCTION trigger_set_timestamp() |
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