api.py: hybrid retrieval with intent routing and cross-encoder rerank

Replaces pure-dense top-8 retrieval with a three-stage pipeline:
- BM25 (tsvector + websearch_to_tsquery) and dense (pgvector) in parallel,
  fused with Reciprocal Rank Fusion
- Optional type filter driven by classify_retrieval_intent() so questions
  about prior conversations don't pull documents and vice versa
- Cross-encoder rerank (ms-marco-MiniLM-L-6-v2) over RRF candidates before
  taking final top-N

Also adds scripts/reindex_docx_pptx.py — one-off re-ingest used to recover
table/header/text-box content in docx and pptx after the 93c0d89 extractor
upgrade — and scripts/test_retrieval.py to exercise the new pipeline against
representative queries.

Schema: requires GIN index on to_tsvector('english', document) (already
created out-of-band via psql since Apache AGE in shared_preload_libraries
blocks ALTER TABLE on this database).

.gitignore

@@ -8,6 +8,7 @@ dreamer_state.json
 corpus_integrity_report.json
 watcher_state.json
 watcher_status.json
+reindex_status.json
 
 # Logs (these belong in /var/log/)
 *.log

scripts/api.py

@@ -1,4 +1,5 @@
 import os
+import re
 import json
 import sqlite3
 import subprocess
@@ -6,7 +7,7 @@ import hashlib
 from pathlib import Path
 from datetime import datetime, timedelta
 from dotenv import load_dotenv
-from sentence_transformers import SentenceTransformer
+from sentence_transformers import SentenceTransformer, CrossEncoder
 import anthropic
 from fastapi import FastAPI, Request, Response, Depends, HTTPException, BackgroundTasks
 import psycopg2
@@ -91,6 +92,7 @@ if HAS_WHISPER:
     except Exception as e:
         print(f"Whisper not available: {e}")
 embedder = SentenceTransformer("all-MiniLM-L6-v2")
+reranker = CrossEncoder("cross-encoder/ms-marco-MiniLM-L-6-v2")
 # ChromaDB removed — using pgvector
 anthropic_client = anthropic.Anthropic(api_key=os.getenv("ANTHROPIC_API_KEY"))
 
@@ -243,30 +245,140 @@ def remove_from_memory(item):
     save_memory("\n".join(filtered))
     return len(lines) - len(filtered)
 
-def retrieve_context(query, n_results=8):
+HYBRID_CANDIDATES = 30
-    """Pure semantic retrieval over pgvector. Top-N by cosine similarity, threshold 0.3.
+RRF_K = 60
-    No CV pinning, no keyword routing — see architecture doc substrate-dependency section.
+FINAL_LIMIT = 8
-    Substrate-level workarounds (entity-keyed routing, hybrid retrieval) live at the
+
-    Graphiti layer, not as wrapper logic above pgvector."""
+_TSQUERY_SANITIZE_RE = re.compile(r"[^\w\s\"'-]")
+
+CONVERSATION_TYPES = ["chatgpt_conversation", "claude_conversation", "aaronai_conversation"]
+DOCUMENT_TYPES = ["document"]
+MEMORY_TYPES = ["claude_memory"]
+
+_CONVO_SIGNALS = (
+    "what did i tell", "what did we discuss", "what did we talk",
+    "in our conversation", "you mentioned", "we talked about",
+    "earlier you said", "earlier i said", "did i tell you",
+    "did i say", "what did chatgpt", "what did claude",
+)
+_DOC_SIGNALS = (
+    "write me a bio", "draft a bio", "my bio", "my cv", "my resume",
+    "my professional", "my work history", "my exhibitions",
+    "my publications", "my syllabi", "my courses", "my teaching",
+    "my philosophy", "about my career", "draft a cover letter",
+    "draft my", "write a bio", "professional bio",
+)
+
+
+def _websearch_query(text: str) -> str:
+    """Strip characters websearch_to_tsquery doesn't handle cleanly. Quoted
+    phrases and 'or' are preserved by the function itself."""
+    return _TSQUERY_SANITIZE_RE.sub(" ", text).strip()
+
+
+def classify_retrieval_intent(query: str):
+    """Return a list of `type` values to filter retrieval on, or None for all types.
+
+    Implementation is a low-effort keyword classifier — explicitly tunable and
+    swappable. For more nuanced routing, replace this with an LLM classifier call
+    that returns the same shape: a list of valid type strings or None.
+
+    Precedence: conversation signals win over document signals — a question like
+    "what did I tell you about my CV" is asking about the conversation, not the CV.
+    """
+    q = query.lower()
+    if any(s in q for s in _CONVO_SIGNALS):
+        return CONVERSATION_TYPES
+    if any(s in q for s in _DOC_SIGNALS):
+        return DOCUMENT_TYPES
+    return None
+
+
+def _rerank(query: str, candidates: list[tuple]) -> list[tuple]:
+    """Cross-encoder rerank. Candidates are (id, document, source) tuples.
+    Returns the same tuples reordered by reranker score (highest first)."""
+    if not candidates:
+        return []
+    pairs = [(query, row[1]) for row in candidates]
+    scores = reranker.predict(pairs)
+    return [row for row, _ in sorted(zip(candidates, scores),
+                                     key=lambda x: x[1], reverse=True)]
+
+
+def retrieve_context(query, n_results=FINAL_LIMIT, type_filter=None):
+    """Hybrid retrieval (dense + lexical, RRF fused) followed by cross-encoder rerank.
+
+    - Dense (pgvector) handles paraphrase / semantic similarity.
+    - Lexical (tsvector) catches rare named tokens (FWN3D, Sono-Tek, course codes)
+      the embedding model has no signal for.
+    - RRF combines the two rankings without calibrating score scales.
+    - Cross-encoder rerank scores each (query, chunk) pair jointly, bridging
+      semantic gaps that bi-encoders can't (e.g., "write me a bio" -> CV chunk).
+
+    type_filter: optional list of `type` values to restrict the candidate pool to.
+    If None, retrieves from all types. Use classify_retrieval_intent() to derive."""
     query_embedding = embedder.encode([query]).tolist()[0]
+    ts_query = _websearch_query(query)
+
     context_pieces = []
     sources = []
+
+    where_sql = ""
+    type_param = ()
+    if type_filter:
+        where_sql = "WHERE type = ANY(%s)"
+        type_param = (list(type_filter),)
+
     try:
         pg = get_pg()
         cur = pg.cursor()
-        cur.execute("""
+
-            SELECT document, source, 1 - (embedding <=> %s::vector) as similarity
+        cur.execute(f"""
+            SELECT id, document, source
             FROM embeddings
+            {where_sql}
             ORDER BY embedding <=> %s::vector
             LIMIT %s
-        """, (query_embedding, query_embedding, n_results))
+        """, (*type_param, query_embedding, HYBRID_CANDIDATES))
-        for doc, source, similarity in cur.fetchall():
+        dense_hits = cur.fetchall()
-            if similarity > 0.3:
+
+        lexical_hits = []
+        if ts_query:
+            lex_where = "to_tsvector('english', document) @@ websearch_to_tsquery('english', %s)"
+            full_where = (f"WHERE {lex_where} AND type = ANY(%s)"
+                          if type_filter else f"WHERE {lex_where}")
+            lex_params = ((ts_query, list(type_filter)) if type_filter else (ts_query,))
+            cur.execute(f"""
+                SELECT id, document, source
+                FROM embeddings
+                {full_where}
+                ORDER BY ts_rank(to_tsvector('english', document),
+                                 websearch_to_tsquery('english', %s)) DESC
+                LIMIT %s
+            """, (*lex_params, ts_query, HYBRID_CANDIDATES))
+            lexical_hits = cur.fetchall()
+
+        pg.close()
+
+        scores = {}
+        rows_by_id = {}
+        for rank, row in enumerate(dense_hits):
+            scores[row[0]] = scores.get(row[0], 0) + 1.0 / (RRF_K + rank + 1)
+            rows_by_id[row[0]] = row
+        for rank, row in enumerate(lexical_hits):
+            scores[row[0]] = scores.get(row[0], 0) + 1.0 / (RRF_K + rank + 1)
+            rows_by_id[row[0]] = row
+
+        rrf_ranked = sorted(scores.items(), key=lambda kv: kv[1], reverse=True)
+        candidates = [rows_by_id[doc_id] for doc_id, _ in rrf_ranked]
+
+        for _id, doc, source in _rerank(query, candidates)[:n_results]:
             context_pieces.append(doc)
             sources.append(source or "unknown")
-        pg.close()
+
     except Exception as e:
-        print(f"pgvector retrieval error: {e}")
+        print(f"hybrid retrieval error: {e}")
+
     return context_pieces, sources
 
 def get_conversation_history(conversation_id, limit=20):
@@ -306,7 +418,8 @@ def create_conversation(title="New conversation"):
 
 def chat(user_message, conversation_id, settings, client_time=None):
     memory = load_memory()
-    context_pieces, sources = retrieve_context(user_message)
+    type_filter = classify_retrieval_intent(user_message)
+    context_pieces, sources = retrieve_context(user_message, type_filter=type_filter)
     history = get_conversation_history(conversation_id)
 
     context_parts = []

scripts/reindex_docx_pptx.py

@@ -0,0 +1,135 @@
+"""One-off: re-ingest docx+pptx after the 2026-05-04 extractor upgrade (commit 93c0d89).
+
+Pre-upgrade extraction missed tables, headers/footers, text boxes, group shapes,
+and pptx notes — leaving CVs/dossiers as section-header skeletons in the index.
+
+Steps when run with --apply:
+  1. DELETE all embeddings rows where source ends in .docx or .pptx
+  2. Walk NEXTCLOUD_PATH and re-ingest every .docx/.pptx via _ingest_one
+  3. Stage 2 enqueue is suppressed (SKIP_STAGE2_ENQUEUE=1)
+
+Without --apply: dry-run. Counts files and chunks, prints a sample, writes nothing.
+"""
+
+import os
+import sys
+import time
+from pathlib import Path
+
+os.environ["SKIP_STAGE2_ENQUEUE"] = "1"
+
+from dotenv import load_dotenv
+load_dotenv(Path.home() / "aaronai" / ".env", override=True)
+
+import psycopg2
+from sentence_transformers import SentenceTransformer
+
+sys.path.insert(0, str(Path(__file__).parent))
+from ingest import _ingest_one, get_pg
+
+NEXTCLOUD_PATH = Path("/home/aaron/nextcloud/data/data/aaron/files")
+TARGET_EXTS = {".docx", ".pptx"}
+
+APPLY = "--apply" in sys.argv
+
+
+def count_stale():
+    pg = get_pg()
+    cur = pg.cursor()
+    cur.execute(
+        "SELECT lower(substring(source from '\\.[^.]+$')) AS ext, "
+        "COUNT(DISTINCT source) AS files, COUNT(*) AS chunks "
+        "FROM embeddings WHERE lower(source) ~ '\\.(docx|pptx)$' "
+        "GROUP BY 1 ORDER BY 1"
+    )
+    rows = cur.fetchall()
+    pg.close()
+    return rows
+
+
+def delete_stale():
+    pg = get_pg()
+    cur = pg.cursor()
+    cur.execute("DELETE FROM embeddings WHERE lower(source) ~ '\\.(docx|pptx)$'")
+    deleted = cur.rowcount
+    pg.commit()
+    pg.close()
+    return deleted
+
+
+def find_files():
+    files = []
+    for f in NEXTCLOUD_PATH.rglob("*"):
+        if not f.is_file():
+            continue
+        if f.suffix.lower() not in TARGET_EXTS:
+            continue
+        if f.name.startswith(("~$", ".")):
+            continue
+        files.append(f)
+    return files
+
+
+def main():
+    print(f"Mode: {'APPLY (destructive)' if APPLY else 'DRY-RUN (no writes)'}")
+    print(f"Target: {NEXTCLOUD_PATH}")
+    print(f"Extensions: {sorted(TARGET_EXTS)}")
+    print(f"SKIP_STAGE2_ENQUEUE={os.environ.get('SKIP_STAGE2_ENQUEUE')}")
+    print()
+
+    print("Stale chunks currently in DB:")
+    for ext, files, chunks in count_stale():
+        print(f"  {ext}: {files} files, {chunks} chunks")
+    print()
+
+    files = find_files()
+    by_ext = {}
+    for f in files:
+        by_ext.setdefault(f.suffix.lower(), []).append(f)
+    print(f"Files on disk to re-ingest:")
+    for ext, lst in sorted(by_ext.items()):
+        print(f"  {ext}: {len(lst)} files")
+    print(f"  total: {len(files)}")
+    print()
+    print("Sample (5 random):")
+    import random
+    for f in random.sample(files, min(5, len(files))):
+        print(f"  {f}")
+    print()
+
+    if not APPLY:
+        print("Dry-run only. Re-run with --apply to delete + re-ingest.")
+        return
+
+    print("Deleting stale chunks...")
+    n = delete_stale()
+    print(f"  deleted {n} rows")
+    print()
+
+    print("Loading embedder...")
+    embedder = SentenceTransformer("all-MiniLM-L6-v2")
+    print()
+
+    print(f"Re-ingesting {len(files)} files...")
+    started = time.time()
+    ingested = failed = total_chunks = 0
+    for i, f in enumerate(files, 1):
+        n = _ingest_one(f, embedder, root=NEXTCLOUD_PATH)
+        if n > 0:
+            ingested += 1
+            total_chunks += n
+        else:
+            failed += 1
+        if i % 25 == 0 or i == len(files):
+            elapsed = time.time() - started
+            rate = i / elapsed if elapsed else 0
+            print(f"  [{i}/{len(files)}] ingested={ingested} failed={failed} "
+                  f"chunks={total_chunks} ({rate:.1f} files/s)")
+    elapsed = time.time() - started
+    print()
+    print(f"Done in {elapsed:.0f}s: {ingested} ingested, {failed} failed, "
+          f"{total_chunks} chunks written.")
+
+
+if __name__ == "__main__":
+    main()

scripts/test_retrieval.py

@@ -0,0 +1,58 @@
+"""End-to-end test of retrieve_context with intent routing + reranking.
+
+Avoids loading the full FastAPI app; replicates the chat-handler retrieval
+call shape and prints classifier output + final ranked sources for each query.
+"""
+
+import os
+import sys
+from pathlib import Path
+
+from dotenv import load_dotenv
+load_dotenv(Path.home() / "aaronai" / ".env", override=True)
+
+sys.path.insert(0, str(Path(__file__).parent))
+
+# Stub anthropic so api.py import doesn't fail without the SDK loaded.
+# We only need retrieve_context + classify_retrieval_intent.
+import types
+sys.modules.setdefault("anthropic", types.ModuleType("anthropic"))
+sys.modules["anthropic"].Anthropic = lambda **kw: None
+
+# Same for whisper if present
+if "faster_whisper" not in sys.modules:
+    sys.modules["faster_whisper"] = types.ModuleType("faster_whisper")
+
+import importlib.util
+spec = importlib.util.spec_from_file_location("api", Path(__file__).parent / "api.py")
+api = importlib.util.module_from_spec(spec)
+# Don't execute the whole module (it starts FastAPI). Instead, exec only definitions.
+# Easier: just import the functions we need by exec'ing the file but catching errors.
+try:
+    spec.loader.exec_module(api)
+except Exception as e:
+    print(f"(continuing despite api.py side-effect error: {e})")
+
+retrieve_context = api.retrieve_context
+classify_retrieval_intent = api.classify_retrieval_intent
+
+QUERIES = [
+    "write me a bio",
+    "my professional bio",
+    "draft a bio for the Utah application",
+    "Aaron Nelson CV consulting and design work",
+    "FWN3D consulting",
+    "syllabi I have taught",
+    "philosophy of teaching",
+    "what did I tell Claude about FWN3D",
+    "what did we discuss about the Utah job",
+    "Hudson Valley Additive Manufacturing Center",
+]
+
+for q in QUERIES:
+    intent = classify_retrieval_intent(q)
+    pieces, sources = retrieve_context(q, type_filter=intent)
+    print(f"\n=== {q!r} ===")
+    print(f"  intent: {intent}")
+    for i, src in enumerate(sources, 1):
+        print(f"  {i}. {src}")