diff --git a/migrations/postgres/000014_query_indexes.down.sql b/migrations/postgres/000014_query_indexes.down.sql
new file mode 100644
index 0000000..24ee589
--- /dev/null
+++ b/migrations/postgres/000014_query_indexes.down.sql
@@ -0,0 +1,6 @@
+DROP INDEX IF EXISTS idx_rev_mat_prefix_uniq;
+DROP INDEX IF EXISTS idx_rev_mat_prefix_rev_cover;
+CREATE INDEX IF NOT EXISTS idx_rev_mat_prefix_rev_id
+    ON revision_materialized_prefix (revision_id, id);
+DROP INDEX IF EXISTS idx_module_tenant_active_sort;
+DROP INDEX IF EXISTS idx_rev_mat_prefix_rev_prefix;
diff --git a/migrations/postgres/000014_query_indexes.up.sql b/migrations/postgres/000014_query_indexes.up.sql
new file mode 100644
index 0000000..cae8b7c
--- /dev/null
+++ b/migrations/postgres/000014_query_indexes.up.sql
@@ -0,0 +1,17 @@
+-- Query indexes: revision diff/list and module sort (H4 + M4).
+
+CREATE INDEX IF NOT EXISTS idx_rev_mat_prefix_rev_prefix
+    ON revision_materialized_prefix (revision_id, prefix);
+
+CREATE INDEX IF NOT EXISTS idx_module_tenant_active_sort
+    ON module (tenant_id, priority, name)
+    WHERE deleted_at IS NULL;
+
+-- Covering index for prefix list pagination (PostgreSQL 11+ INCLUDE).
+DROP INDEX IF EXISTS idx_rev_mat_prefix_rev_id;
+CREATE INDEX IF NOT EXISTS idx_rev_mat_prefix_rev_cover
+    ON revision_materialized_prefix (revision_id, id)
+    INCLUDE (prefix, community_id, source);
+
+CREATE UNIQUE INDEX IF NOT EXISTS idx_rev_mat_prefix_uniq
+    ON revision_materialized_prefix (revision_id, prefix, community_id, source);
diff --git a/migrations/sqlite/000014_query_indexes.down.sql b/migrations/sqlite/000014_query_indexes.down.sql
new file mode 100644
index 0000000..88dd0df
--- /dev/null
+++ b/migrations/sqlite/000014_query_indexes.down.sql
@@ -0,0 +1,3 @@
+DROP INDEX IF EXISTS idx_rev_mat_prefix_uniq;
+DROP INDEX IF EXISTS idx_module_tenant_active_sort;
+DROP INDEX IF EXISTS idx_rev_mat_prefix_rev_prefix;
diff --git a/migrations/sqlite/000014_query_indexes.up.sql b/migrations/sqlite/000014_query_indexes.up.sql
new file mode 100644
index 0000000..5236e05
--- /dev/null
+++ b/migrations/sqlite/000014_query_indexes.up.sql
@@ -0,0 +1,9 @@
+CREATE INDEX IF NOT EXISTS idx_rev_mat_prefix_rev_prefix
+    ON revision_materialized_prefix (revision_id, prefix);
+
+CREATE INDEX IF NOT EXISTS idx_module_tenant_active_sort
+    ON module (tenant_id, priority, name)
+    WHERE deleted_at IS NULL;
+
+CREATE UNIQUE INDEX IF NOT EXISTS idx_rev_mat_prefix_uniq
+    ON revision_materialized_prefix (revision_id, prefix, community_id, source);