feat: Windows native support — run Hindsight without Docker (#699)

* feat: Windows native support — run Hindsight without Docker on Windows

Four compatibility fixes that allow Hindsight to run natively on Windows
with an external PostgreSQL + pgvector installation:

1. **pyproject.toml**: Conditional event loop dependency
   - `winloop` on Windows (sys_platform == 'win32')
   - `uvloop` on Linux/macOS (sys_platform != 'win32')

2. **main.py**: winloop integration via `winloop.install()`
   - Patches asyncio event loop policy globally before uvicorn starts
   - uvicorn sees "asyncio" but runs winloop underneath (same perf as uvloop)
   - Falls back to default asyncio if winloop unavailable

3. **metrics.py**: Guard `resource` module import
   - `resource` is Unix-only (getrusage, getrlimit)
   - Conditional import with None fallback
   - Skip process metrics collection on Windows

4. **fact_storage.py**: Cross-platform strftime
   - `%-d` (no-padding day) is glibc-only, fails on Windows
   - Replaced with `%d` + `.replace(" 0", " ")` for same output

## Windows Setup Guide

### Prerequisites
- Python 3.11+
- PostgreSQL 17 with pgvector extension
- Ollama (for local embeddings) or external embedding provider

### Install PostgreSQL + pgvector on Windows
```bash
winget install PostgreSQL.PostgreSQL.17

# Build pgvector from source (requires Visual Studio Build Tools)
git clone https://github.com/pgvector/pgvector.git
# In x64 Native Tools Command Prompt:
set PGROOT=C:\Program Files\PostgreSQL\17
nmake /F Makefile.win
nmake /F Makefile.win install

# Enable extension
psql -U postgres -d hindsight -c "CREATE EXTENSION IF NOT EXISTS vector;"
```

### Install and Run Hindsight
```bash
pip install -e ".[embedded-db]"

# Set environment variables
set HINDSIGHT_API_LLM_PROVIDER=openai
set HINDSIGHT_API_LLM_API_KEY=your-api-key
set HINDSIGHT_API_LLM_BASE_URL=https://your-llm-endpoint/v1
set HINDSIGHT_API_LLM_MODEL=your-model
set HINDSIGHT_API_DATABASE_URL=postgresql://postgres@localhost:5432/hindsight
set HINDSIGHT_API_EMBEDDING_PROVIDER=ollama
set HINDSIGHT_API_PORT=8889

hindsight-api
```

Data persists in PostgreSQL on your local disk — survives reboots,
updates, and anything that would wipe a Docker volume.

Tested on Windows 11 with PostgreSQL 17.9, pgvector 0.8.2,
Python 3.11, RTX 5080 (CUDA embeddings + reranking).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: handle strftime ValueError on Windows in fact_storage

The strftime call on occurred_start/occurred_end can raise ValueError
on Windows when the datetime object has unexpected format properties.
Wrap in try/except to gracefully skip date signal rather than crash
the entire retain batch.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

hindsight-api-slim/hindsight_api/engine/retain/fact_storage.py

@@ -81,9 +81,15 @@ async def insert_facts_batch(
         if fact.entities:
             signal_parts.extend(e.name for e in fact.entities)
         if fact.occurred_start:
-            signal_parts.append(fact.occurred_start.strftime("%B %-d %Y"))
+            try:
+                signal_parts.append(fact.occurred_start.strftime("%B %d %Y").lstrip("0").replace(" 0", " "))
+            except (ValueError, AttributeError):
+                pass
         if fact.occurred_end and fact.occurred_end != fact.occurred_start:
-            signal_parts.append(fact.occurred_end.strftime("%B %-d %Y"))
+            try:
+                signal_parts.append(fact.occurred_end.strftime("%B %d %Y").lstrip("0").replace(" 0", " "))
+            except (ValueError, AttributeError):
+                pass
         text_signals_list.append(" ".join(signal_parts) if signal_parts else None)
 
     # Batch insert all facts

hindsight-api-slim/hindsight_api/main.py

@@ -211,14 +211,23 @@ def main():
     # Prepare uvicorn config
     # When using workers or reload, we must use import string so each worker can import the app
     use_import_string = args.workers > 1 or args.reload
-    # Check for uvloop availability
+    # Check for uvloop/winloop availability
+    import sys
+    loop_impl = "asyncio"
+    if sys.platform == "win32":
+        try:
+            import winloop
+            winloop.install()  # Patches asyncio globally — uvicorn uses "asyncio" but gets winloop
+            loop_impl = "asyncio"  # Tell uvicorn "asyncio" — it's now winloop underneath
+            print("winloop installed as asyncio event loop policy (Windows uvloop port)")
+        except ImportError:
+            print("winloop not installed, using default asyncio event loop")
+    else:
         try:
             import uvloop  # noqa: F401
-
             loop_impl = "uvloop"
             print("uvloop available, will use for event loop")
         except ImportError:
-        loop_impl = "asyncio"
             print("uvloop not installed, using default asyncio event loop")
 
     uvicorn_config = {

hindsight-api-slim/hindsight_api/metrics.py

@@ -13,7 +13,10 @@ This module provides metrics for:
 
 import logging
 import os
+try:
     import resource
+except ImportError:
+    resource = None  # Windows doesn't have resource module
 import threading
 import time
 from contextlib import contextmanager
@@ -455,6 +458,8 @@ class MetricsCollector(MetricsCollectorBase):
 
     def _setup_process_metrics(self):
         """Set up observable gauges for process metrics."""
+        if resource is None:
+            return  # Skip process metrics on Windows
 
         def get_cpu_times(_options):
             """Get process CPU times."""

hindsight-api-slim/pyproject.toml

@@ -43,7 +43,8 @@ dependencies = [
     "litellm>=1.0.0,<=1.82.6", # 1.82.7+ contains a supply chain attack (malicious .pth credential stealer)
     "markitdown[pdf,docx,pptx,xlsx,xls]>=0.1.4", # File to markdown conversion
     "obstore>=0.4.0", # S3/GCS/Azure object storage client (Rust-backed)
-    "uvloop>=0.22.1",
+    "winloop>=0.1.0; sys_platform == 'win32'",
+    "uvloop>=0.22.1; sys_platform != 'win32'",
     # Transitive dependency security fixes
     "pyasn1>=0.6.3", # DoS vulnerability fix
     "urllib3>=2.6.3", # Decompression-bomb safeguards bypass fix