stripped tracking params, added tags

URLs are cleaned of tracking parameters (utm_*, fbclid, gclid, etc.)
before indexing. Tags can be added when saving or editing pages,
browsed at /tags, and are included in search results. Tags are shared
via /api/sites and preserved when syncing/importing from subscriptions.

db.py

@@ -1,12 +1,26 @@
 import sqlite3
 import requests
-from urllib.parse import urlparse, urljoin
+from urllib.parse import urlparse, urljoin, parse_qs, urlencode, urlunparse
 from bs4 import BeautifulSoup
 
 DATABASE = "index.db"
 
 SKIP_EXT = (".png", ".jpg", ".jpeg", ".gif", ".svg", ".pdf", ".zip", ".mp3", ".mp4", ".css", ".js", ".ico", ".xml", ".json")
 
+TRACKING_PARAMS = {
+    "utm_source", "utm_medium", "utm_campaign", "utm_term", "utm_content",
+    "fbclid", "gclid", "msclkid", "mc_cid", "mc_eid", "ref", "ref_src",
+    "ref_url", "_ga", "_gl", "yclid", "twclid", "igshid",
+}
+
+
+def clean_url(url):
+    parsed = urlparse(url)
+    params = parse_qs(parsed.query)
+    cleaned = {k: v for k, v in params.items() if k.lower() not in TRACKING_PARAMS}
+    new_query = urlencode(cleaned, doseq=True)
+    return urlunparse(parsed._replace(query=new_query))
+
 
 def get_db():
     db = sqlite3.connect(DATABASE)
@@ -60,6 +74,7 @@ def init_db():
         "  url TEXT NOT NULL,"
         "  title TEXT,"
         "  note TEXT DEFAULT '',"
+        "  tags TEXT DEFAULT '',"
         "  FOREIGN KEY (subscription_id) REFERENCES subscriptions(id) ON DELETE CASCADE,"
         "  UNIQUE(subscription_id, url)"
         ")"
@@ -68,6 +83,21 @@ def init_db():
         "CREATE VIRTUAL TABLE IF NOT EXISTS remote_pages_fts "
         "USING fts5(title, url, note, content=remote_pages, content_rowid=id)"
     )
+    db.execute(
+        "CREATE TABLE IF NOT EXISTS tags ("
+        "  id INTEGER PRIMARY KEY AUTOINCREMENT,"
+        "  name TEXT UNIQUE NOT NULL"
+        ")"
+    )
+    db.execute(
+        "CREATE TABLE IF NOT EXISTS page_tags ("
+        "  page_id INTEGER NOT NULL,"
+        "  tag_id INTEGER NOT NULL,"
+        "  PRIMARY KEY (page_id, tag_id),"
+        "  FOREIGN KEY (page_id) REFERENCES pages(id) ON DELETE CASCADE,"
+        "  FOREIGN KEY (tag_id) REFERENCES tags(id) ON DELETE CASCADE"
+        ")"
+    )
     db.executescript("""
         CREATE TRIGGER IF NOT EXISTS pages_ai AFTER INSERT ON pages BEGIN
             INSERT INTO pages_fts(rowid, title, body, url, note)
@@ -104,6 +134,12 @@ def init_db():
         db.execute("ALTER TABLE subscriptions RENAME COLUMN url TO dest_hash")
         db.commit()
 
+    # Migrate remote_pages: add tags column if missing
+    rp_cols = [row[1] for row in db.execute("PRAGMA table_info(remote_pages)").fetchall()]
+    if "tags" not in rp_cols:
+        db.execute("ALTER TABLE remote_pages ADD COLUMN tags TEXT DEFAULT ''")
+        db.commit()
+
     db.commit()
     db.close()
 
@@ -165,6 +201,7 @@ def fetch_page(url):
 
 
 def index_url(url, note=""):
+    url = clean_url(url)
     title, body, links = fetch_page(url)
     db = get_db()
     cur = db.execute(