diff --git a/IDHANMigration/src/105-active_tag_parents_triggers.sql b/IDHANMigration/src/105-active_tag_parents_triggers.sql
new file mode 100644
index 0000000..20729d8
--- /dev/null
+++ b/IDHANMigration/src/105-active_tag_parents_triggers.sql
@@ -0,0 +1,157 @@
+CREATE OR REPLACE FUNCTION insert_parent_mapping()
+    RETURNS trigger
+    LANGUAGE plpgsql
+    VOLATILE
+AS
+$$
+BEGIN
+    -- 1.  Insert the direct mapping (parent → child)
+    INSERT INTO active_tag_mappings_parents
+        (record_id, tag_id, origin_id, tag_domain_id)
+    SELECT tm.record_id      as record_id,
+           new.parent_id     as parent_id,
+           new.child_id      as child_id,
+           new.tag_domain_id as tag_domain_id
+    FROM active_tag_mappings tm
+    WHERE tm.tag_domain_id = new.tag_domain_id
+      AND tm.tag_id = new.child_id
+    ON CONFLICT (record_id, tag_id, origin_id, tag_domain_id)
+        DO NOTHING;
+    -- the PK guarantees uniqueness
+
+    -- 2.  Insert all ancestor parents of the child, and bump the counter
+    WITH ancestor AS (SELECT atmp.record_id    AS record_id,
+                             new.parent_id     AS tag_id,
+                             atmp.origin_id    AS origin_id,
+                             new.tag_domain_id AS tag_domain_id
+                      FROM active_tag_mappings_parents atmp
+                      WHERE atmp.tag_domain_id = new.tag_domain_id
+                        AND atmp.tag_id = new.child_id)
+    INSERT
+    INTO active_tag_mappings_parents
+        (record_id, tag_id, origin_id, tag_domain_id, internal_count)
+    SELECT record_id,
+           tag_id,
+           origin_id,
+           tag_domain_id,
+           0 AS internal_count
+    FROM ancestor
+    ON CONFLICT (record_id, tag_id, origin_id, tag_domain_id)
+        DO UPDATE SET internal_count = excluded.internal_count + 1;
+
+    RETURN new;
+END;
+$$;
+
+CREATE OR REPLACE FUNCTION delete_parent_mapping()
+    RETURNS trigger
+    LANGUAGE plpgsql
+    VOLATILE
+AS
+$$
+BEGIN
+    DELETE
+    FROM active_tag_mappings_parents
+    WHERE tag_id = old.parent_id
+      AND origin_id = old.child_id
+      AND tag_domain_id = old.tag_domain_id;
+
+    RETURN old;
+END;
+$$;
+
+CREATE OR REPLACE FUNCTION insert_parents_from_active_mappings()
+    RETURNS trigger
+    LANGUAGE plpgsql
+    VOLATILE
+AS
+$$
+BEGIN
+    INSERT INTO active_tag_mappings_parents
+        (record_id, tag_id, origin_id, tag_domain_id, internal_count)
+    SELECT new.record_id     as record_id,
+           tp.parent_id      as tag_id,
+           new.tag_id        as origin_id,
+           new.tag_domain_id as tag_domain_id,
+           0                 AS internal_count
+    FROM tag_parents tp
+    WHERE tp.tag_domain_id = new.tag_domain_id
+      AND tp.child_id = new.tag_id
+    ON CONFLICT (record_id, tag_id, origin_id, tag_domain_id)
+        DO UPDATE SET internal_count = excluded.internal_count + 1;
+
+    RETURN new;
+END;
+$$;
+
+CREATE OR REPLACE FUNCTION delete_parents_from_active_mappings()
+    RETURNS trigger
+    LANGUAGE plpgsql
+    VOLATILE
+AS
+$$
+BEGIN
+    -- 2.  Delete those that are no longer referenced
+    DELETE
+    FROM active_tag_mappings_parents
+    WHERE record_id = old.record_id
+      AND origin_id = old.tag_id
+      AND tag_domain_id = old.tag_domain_id
+      AND NOT internal;
+
+    RETURN old;
+END;
+$$;
+
+CREATE OR REPLACE FUNCTION intercept_parent_mapping()
+    RETURNS trigger
+    LANGUAGE plpgsql
+    VOLATILE
+AS
+$$
+BEGIN
+    new.ideal_tag_id := (SELECT ta.effective_tag_id
+                         FROM tag_aliases ta
+                         WHERE ta.tag_domain_id = new.tag_domain_id
+                           AND ta.aliased_id = new.tag_id);
+
+    RETURN new;
+END;
+$$;
+
+DROP TRIGGER trg_delete_active_tag_mapping_parent ON tag_parents;
+DROP TRIGGER trg_insert_active_tag_mapping_parent ON tag_parents;
+
+DROP TRIGGER trg_delete_active_tag_mappings_parents_from_mappings ON active_tag_mappings;
+DROP TRIGGER trg_insert_active_tag_mappings_parents_from_mappings ON active_tag_mappings;
+DROP TRIGGER trg_intercept_active_tag_mappings_parents ON active_tag_mappings;
+
+CREATE TRIGGER trg_insert_parent_mapping
+    AFTER INSERT
+    ON tag_parents
+    FOR EACH ROW
+EXECUTE FUNCTION insert_parent_mapping();
+
+CREATE TRIGGER trg_delete_parent_mapping
+    AFTER DELETE
+    ON tag_parents
+    FOR EACH ROW
+EXECUTE FUNCTION delete_parent_mapping();
+
+CREATE TRIGGER trg_insert_parents_from_active_mappings
+    AFTER INSERT
+    ON active_tag_mappings
+    FOR EACH ROW
+EXECUTE FUNCTION insert_parents_from_active_mappings();
+
+CREATE TRIGGER trg_delete_parents_from_active_mappings
+    AFTER DELETE
+    ON active_tag_mappings
+    FOR EACH ROW
+EXECUTE FUNCTION delete_parents_from_active_mappings();
+
+CREATE TRIGGER trg_intercept_parent_mapping
+    BEFORE INSERT
+    ON active_tag_mappings
+    FOR EACH ROW
+EXECUTE FUNCTION intercept_parent_mapping();
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