[C] Remove unused indices

These indices are huge and not getting used by the query planner.

api/db/migrate/20241206175512_remove_unused_text_section_node_indices.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+class RemoveUnusedTextSectionNodeIndices < ActiveRecord::Migration[6.1]
+  def up
+    execute <<~SQL
+    DROP INDEX IF EXISTS index_text_section_nodes_pairing;
+
+    DROP INDEX IF EXISTS index_text_section_nodes_on_node_path;
+
+    DROP INDEX IF EXISTS index_text_section_nodes_by_id_and_hash;
+    SQL
+  end
+
+  def down
+    # Intentionally left blank. We won't add these indices back.
+  end
+end

api/db/structure.sql

@@ -5576,13 +5576,6 @@ CREATE UNIQUE INDEX index_text_exports_uniqueness ON public.text_exports USING b
 CREATE INDEX index_text_section_nodes_actual_ancestors ON public.text_section_nodes USING gist (node_path) WHERE (NOT intermediate);
 
 
---
--- Name: index_text_section_nodes_by_id_and_hash; Type: INDEX; Schema: public; Owner: -
---
-
-CREATE INDEX index_text_section_nodes_by_id_and_hash ON public.text_section_nodes USING btree (text_section_id, body_hash);
-
-
 --
 -- Name: index_text_section_nodes_by_uuid; Type: INDEX; Schema: public; Owner: -
 --
@@ -5604,27 +5597,13 @@ CREATE INDEX index_text_section_nodes_child_ordering ON public.text_section_node
 CREATE INDEX index_text_section_nodes_extrapolation ON public.text_section_nodes USING btree (text_section_id, extrapolated_at);
 
 
---
--- Name: index_text_section_nodes_on_node_path; Type: INDEX; Schema: public; Owner: -
---
-
-CREATE INDEX index_text_section_nodes_on_node_path ON public.text_section_nodes USING gist (node_path);
-
-
 --
 -- Name: index_text_section_nodes_on_text_section_id; Type: INDEX; Schema: public; Owner: -
 --
 
 CREATE INDEX index_text_section_nodes_on_text_section_id ON public.text_section_nodes USING btree (text_section_id);
 
 
---
--- Name: index_text_section_nodes_pairing; Type: INDEX; Schema: public; Owner: -
---
-
-CREATE INDEX index_text_section_nodes_pairing ON public.text_section_nodes USING btree (node_path) INCLUDE (path);
-
-
 --
 -- Name: index_text_section_nodes_uniqueness; Type: INDEX; Schema: public; Owner: -
 --
@@ -7194,6 +7173,7 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20231129172116'),
 ('20240220212417'),
 ('20240223163849'),
-('20240327194259');
+('20240327194259'),
+('20241206175512');