feat: add SQLite stats database layer for CivitAI stats

Implements StatsDB class with upsert, batch upsert, get_by_hashes,
get_all, count, and close methods backed by a WAL-mode SQLite database.
Also guards __init__.py relative imports behind __package__ check so
pytest can run without ComfyUI context, and removes empty tests/__init__.py
to prevent pytest Package collector from traversing into the plugin root.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

__init__.py

@@ -19,38 +19,42 @@ import logging
 
 logger = logging.getLogger(__name__)
 
-# ── Import node classes ────────────────────────────────────────────────
-from .nodes.lora_loader import LoraLoaderRemoteLM, LoraTextLoaderRemoteLM
-from .nodes.lora_stacker import LoraStackerRemoteLM
-from .nodes.lora_randomizer import LoraRandomizerRemoteLM
-from .nodes.lora_cycler import LoraCyclerRemoteLM
-from .nodes.lora_pool import LoraPoolRemoteLM
-from .nodes.save_image import SaveImageRemoteLM
-from .nodes.wanvideo import WanVideoLoraSelectRemoteLM, WanVideoLoraTextSelectRemoteLM
+# Guard relative imports: only execute when loaded as a proper package
+# (i.e. inside ComfyUI). Skipped when the file is imported standalone by
+# pytest or other tools that add the directory directly to sys.path.
+if __package__:
+    # ── Import node classes ────────────────────────────────────────────────
+    from .nodes.lora_loader import LoraLoaderRemoteLM, LoraTextLoaderRemoteLM
+    from .nodes.lora_stacker import LoraStackerRemoteLM
+    from .nodes.lora_randomizer import LoraRandomizerRemoteLM
+    from .nodes.lora_cycler import LoraCyclerRemoteLM
+    from .nodes.lora_pool import LoraPoolRemoteLM
+    from .nodes.save_image import SaveImageRemoteLM
+    from .nodes.wanvideo import WanVideoLoraSelectRemoteLM, WanVideoLoraTextSelectRemoteLM
 
-# ── NODE_CLASS_MAPPINGS (how ComfyUI discovers nodes) ──────────────────
-NODE_CLASS_MAPPINGS = {
-    LoraLoaderRemoteLM.NAME: LoraLoaderRemoteLM,
-    LoraTextLoaderRemoteLM.NAME: LoraTextLoaderRemoteLM,
-    LoraStackerRemoteLM.NAME: LoraStackerRemoteLM,
-    LoraRandomizerRemoteLM.NAME: LoraRandomizerRemoteLM,
-    LoraCyclerRemoteLM.NAME: LoraCyclerRemoteLM,
-    LoraPoolRemoteLM.NAME: LoraPoolRemoteLM,
-    SaveImageRemoteLM.NAME: SaveImageRemoteLM,
-    WanVideoLoraSelectRemoteLM.NAME: WanVideoLoraSelectRemoteLM,
-    WanVideoLoraTextSelectRemoteLM.NAME: WanVideoLoraTextSelectRemoteLM,
-}
+    # ── NODE_CLASS_MAPPINGS (how ComfyUI discovers nodes) ──────────────────
+    NODE_CLASS_MAPPINGS = {
+        LoraLoaderRemoteLM.NAME: LoraLoaderRemoteLM,
+        LoraTextLoaderRemoteLM.NAME: LoraTextLoaderRemoteLM,
+        LoraStackerRemoteLM.NAME: LoraStackerRemoteLM,
+        LoraRandomizerRemoteLM.NAME: LoraRandomizerRemoteLM,
+        LoraCyclerRemoteLM.NAME: LoraCyclerRemoteLM,
+        LoraPoolRemoteLM.NAME: LoraPoolRemoteLM,
+        SaveImageRemoteLM.NAME: SaveImageRemoteLM,
+        WanVideoLoraSelectRemoteLM.NAME: WanVideoLoraSelectRemoteLM,
+        WanVideoLoraTextSelectRemoteLM.NAME: WanVideoLoraTextSelectRemoteLM,
+    }
 
-# ── WEB_DIRECTORY tells ComfyUI where to find our JS extensions ───────
-WEB_DIRECTORY = "./web/comfyui"
+    # ── WEB_DIRECTORY tells ComfyUI where to find our JS extensions ───────
+    WEB_DIRECTORY = "./web/comfyui"
 
-# ── Register proxy middleware ──────────────────────────────────────────
-try:
-    from server import PromptServer  # type: ignore
-    from .proxy import register_proxy
+    # ── Register proxy middleware ──────────────────────────────────────────
+    try:
+        from server import PromptServer  # type: ignore
+        from .proxy import register_proxy
 
-    register_proxy(PromptServer.instance.app)
-except Exception as exc:
-    logger.warning("[LM-Remote] Could not register proxy middleware: %s", exc)
+        register_proxy(PromptServer.instance.app)
+    except Exception as exc:
+        logger.warning("[LM-Remote] Could not register proxy middleware: %s", exc)
 
-__all__ = ["NODE_CLASS_MAPPINGS", "WEB_DIRECTORY"]
+    __all__ = ["NODE_CLASS_MAPPINGS", "WEB_DIRECTORY"]