Add Knowledgebase MCP server — persistent memory for Claude conversations

PostgreSQL-backed knowledge store with hybrid search:
- Full-text search via tsvector (always available)
- Semantic reranking via Voyage AI embeddings + Python cosine similarity
- Tables: kb_memories, kb_sessions, kb_messages
- Tools: store_memory, store_conversation, search, get_context, get_recent, stats

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

Knowledgebase/setup_db.py

@@ -0,0 +1,68 @@
+#!/usr/bin/env python3
+"""
+Inicializace Knowledgebase databáze.
+Vytvoří databázi 'knowledgebase' a aplikuje schema.sql.
+
+Spustit jednou:
+  python setup_db.py
+"""
+import os
+import sys
+import psycopg
+from psycopg.rows import dict_row
+from pathlib import Path
+
+PG_HOST     = os.getenv("PG_HOST",     "192.168.1.76")
+PG_PORT     = int(os.getenv("PG_PORT", "5432"))
+PG_USER     = os.getenv("PG_USER",     "vladimir.buzalka")
+PG_PASSWORD = os.getenv("PG_PASSWORD", "Vlado7309208104++")
+
+SCHEMA_FILE = Path(__file__).parent / "schema.sql"
+
+
+def main():
+    # ── Připoj se k postgres a vytvoř DB ──
+    print("Connecting to postgres...")
+    with psycopg.connect(
+        host=PG_HOST, port=PG_PORT,
+        user=PG_USER, password=PG_PASSWORD,
+        dbname="postgres",
+        autocommit=True,
+    ) as conn:
+        exists = conn.execute(
+            "SELECT 1 FROM pg_database WHERE datname = 'knowledgebase'"
+        ).fetchone()
+        if not exists:
+            conn.execute("CREATE DATABASE knowledgebase")
+            print("Created database 'knowledgebase'")
+        else:
+            print("Database 'knowledgebase' already exists")
+
+    # ── Aplikuj schema ──
+    print("Applying schema...")
+    schema = SCHEMA_FILE.read_text(encoding="utf-8")
+    with psycopg.connect(
+        host=PG_HOST, port=PG_PORT,
+        user=PG_USER, password=PG_PASSWORD,
+        dbname="knowledgebase",
+        autocommit=True,
+    ) as conn:
+        conn.execute(schema)
+    print("Schema applied successfully.")
+    print()
+    print("Done! Knowledgebase database is ready.")
+    print()
+    print("Next steps:")
+    print("  1. pip install -r requirements.txt")
+    print("  2. Optional: set VOYAGE_API_KEY=...")
+    print("  3. Add server to Claude Code settings (see below)")
+    print()
+    print('  "knowledgebase": {')
+    print('    "command": "python",')
+    print('    "args": ["U:/janssen/Knowledgebase/server.py"],')
+    print('    "env": {"VOYAGE_API_KEY": "..."}')
+    print('  }')
+
+
+if __name__ == "__main__":
+    main()