Add a column to count the number of target selectors to annotations

We intend to use whether we have targets to work out what type of annotation
we have. We can use this to differentiate between replies, page notes and
others.

h/data_tasks/report/create_from_scratch/03_annotations/01_create_table.sql

@@ -11,6 +11,7 @@ CREATE TABLE report.annotations (
     updated TIMESTAMP NOT NULL,
     deleted BOOLEAN NOT NULL,
     shared BOOLEAN NOT NULL,
+    target_selectors INT NOT NULL,
     size INT,
     parent_uuids UUID[],
     tags TEXT[]

h/data_tasks/report/create_from_scratch/03_annotations/02_initial_fill.sql

@@ -11,7 +11,7 @@ INSERT INTO report.annotations (
     uuid,
     user_id, group_id, document_id, authority_id,
     created, updated,
-    deleted, shared, size,
+    deleted, shared, target_selectors, size,
     parent_uuids, tags
 )
 SELECT
@@ -26,6 +26,7 @@ SELECT
     annotation.updated,
     deleted,
     shared,
+    JSONB_ARRAY_LENGTH(target_selectors) AS target_selectors,
     LENGTH(text) AS size,
     "references",
     tags

h/data_tasks/report/refresh/01_annotations_refresh.sql

@@ -17,7 +17,7 @@ INSERT INTO report.annotations (
     uuid,
     user_id, group_id, document_id, authority_id,
     created, updated,
-    deleted, shared, size,
+    deleted, shared, target_selectors, size,
     parent_uuids, tags
 )
 SELECT
@@ -30,6 +30,7 @@ SELECT
     annotation.updated::date,
     deleted,
     shared,
+    JSONB_ARRAY_LENGTH(target_selectors) AS target_selectors,
     LENGTH(text) AS size,
     "references",
     tags
@@ -51,6 +52,7 @@ ON CONFLICT (uuid) DO UPDATE SET
     group_id=EXCLUDED.group_id,
     deleted=EXCLUDED.deleted,
     shared=EXCLUDED.shared,
+    target_selectors=EXCLUDED.target_selectors,
     size=EXCLUDED.size,
     parent_uuids=EXCLUDED.parent_uuids,
     tags=EXCLUDED.tags;