Cover the Postgres queue construction paths in CI

pyproject.toml

@@ -135,6 +135,10 @@ filterwarnings = ["error", "ignore::UserWarning", "ignore::DeprecationWarning"]
 
 [tool.coverage.run]
 source = ["haiku_rag_slim"]
+# aiosqlite runs sqlite (and the queue's PRAGMA connect listener) off the main
+# flow via a greenlet + worker thread; track both so that code isn't reported
+# as uncovered.
+concurrency = ["greenlet", "thread"]
 omit = [
     "haiku_rag_slim/haiku/rag/chat/*",
     "haiku_rag_slim/haiku/rag/inspector/*",

tests/ingester/test_queue.py

@@ -5,9 +5,14 @@ import pytest
 import sqlalchemy as sa
 
 from haiku.rag.config import QueueConfig
-from haiku.rag.ingester.queue.migrations import apply_migrations, open_queue
+from haiku.rag.ingester.queue.db import jobs as jobs_table
+from haiku.rag.ingester.queue.migrations import (
+    apply_migrations,
+    make_engine,
+    open_queue,
+)
 from haiku.rag.ingester.queue.models import JobOp, JobStatus, SyncRow
-from haiku.rag.ingester.queue.repository import JobRepo
+from haiku.rag.ingester.queue.repository import JobRepo, _insert
 
 # --- migrations / schema ---
 
@@ -44,6 +49,26 @@ async def test_open_queue_creates_file_and_schema(tmp_path):
         await eng.dispose()
 
 
+@pytest.mark.asyncio
+async def test_make_engine_postgres_is_pre_ping():
+    """The Postgres branch builds a pre-ping engine without connecting."""
+    engine = make_engine(QueueConfig(dburi="postgresql+asyncpg://u:p@localhost/db"))
+    try:
+        assert engine.dialect.name == "postgresql"
+        assert engine.pool._pre_ping is True
+    finally:
+        await engine.dispose()
+
+
+def test_insert_uses_dialect_specific_construct():
+    """_insert dispatches to the dialect's INSERT (which exposes on_conflict_*)."""
+    from sqlalchemy.dialects.postgresql import Insert as PostgresInsert
+    from sqlalchemy.dialects.sqlite import Insert as SqliteInsert
+
+    assert isinstance(_insert(jobs_table, "postgresql"), PostgresInsert)
+    assert isinstance(_insert(jobs_table, "sqlite"), SqliteInsert)
+
+
 @pytest.mark.asyncio
 async def test_open_queue_handles_path_with_url_chars(tmp_path):
     """A `?` (or `#`) is a valid POSIX filename char but has URL meaning.