feat(feed): per-user search finds in Mine scope + full-text relevance search

Two related search improvements:

1) Your own live-search results now belong to your Mine feed. A new per-user
   search_finds table (migration 0030) records each video you surface via your
   YouTube search (the route inserts them idempotently). The Mine feed becomes
   'your non-hidden subscriptions OR your search finds', and the Source filter
   now applies in Mine too: organic = subscriptions, search = your search finds,
   all = both (default stays organic, so the main feed is unchanged). The shared
   Library keeps using the global via_search flag.

2) Feed search ranks by relevance instead of a whole-phrase substring. A custom
   unaccent_simple text-search config + GIN index (migration 0031) back a
   YouTube-like fuzzy match: word-order-independent, multi-word AND, prefix on
   the word being typed, accent-insensitive. A new 'relevance' sort orders by
   ts_rank; the channel name still matches as a substring. The rank is scaled to
   an integer so the keyset cursor pages it exactly (a raw float4 breaks paging).
   _filtered_query returns the rank expr so only the feed list uses it.

backend/alembic/versions/0030_search_finds.py

@@ -0,0 +1,47 @@
+"""per-user search finds
+
+Revision ID: 0030_search_finds
+Revises: 0029_unaccent_search
+Create Date: 2026-06-30
+
+Adds the `search_finds` table: a per-user record of which videos a user surfaced via their own
+live YouTube search. This lets "videos I searched for" appear in that user's Mine feed (and the
+Mine Source filter), independent of the global `videos.via_search` flag (which marks a video as
+search-discovered by anyone, for the shared Library's Source filter).
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "0030_search_finds"
+down_revision: Union[str, None] = "0029_unaccent_search"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "search_finds",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("user_id", sa.Integer(), nullable=False),
+        sa.Column("video_id", sa.String(), nullable=False),
+        sa.Column(
+            "created_at",
+            sa.DateTime(timezone=True),
+            server_default=sa.text("now()"),
+            nullable=False,
+        ),
+        sa.ForeignKeyConstraint(["user_id"], ["users.id"], ondelete="CASCADE"),
+        sa.ForeignKeyConstraint(["video_id"], ["videos.id"], ondelete="CASCADE"),
+        sa.PrimaryKeyConstraint("id"),
+        sa.UniqueConstraint("user_id", "video_id", name="uq_user_search_video"),
+    )
+    op.create_index("ix_search_finds_user_id", "search_finds", ["user_id"])
+    op.create_index("ix_search_finds_video_id", "search_finds", ["video_id"])
+
+
+def downgrade() -> None:
+    op.drop_index("ix_search_finds_video_id", table_name="search_finds")
+    op.drop_index("ix_search_finds_user_id", table_name="search_finds")
+    op.drop_table("search_finds")

backend/alembic/versions/0031_title_fts.py

@@ -0,0 +1,49 @@
+"""full-text relevance search on video titles
+
+Revision ID: 0031_title_fts
+Revises: 0030_search_finds
+Create Date: 2026-06-30
+
+Adds a PostgreSQL full-text search index over video titles so the feed search box can rank by
+relevance (a YouTube-like "fuzzy" search: word-order-independent, multi-word AND, prefix on the
+word being typed) instead of a whole-phrase substring match.
+
+A custom text-search configuration `unaccent_simple` = the `simple` config (no stemming, no
+stopwords — right for a multilingual HU/EN/DE catalog) plus the `unaccent` dictionary, so the
+search stays accent-insensitive ("tiesto" matches "Tiësto"). A GIN expression index on
+`to_tsvector('public.unaccent_simple', coalesce(title,''))` makes the @@ match fast; the feed
+query uses the exact same expression so the planner picks the index. `unaccent` is already
+enabled (migration 0029). The config-based 2-arg to_tsvector is IMMUTABLE, so it's index-safe.
+"""
+from typing import Sequence, Union
+
+from alembic import op
+
+revision: str = "0031_title_fts"
+down_revision: Union[str, None] = "0030_search_finds"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.execute(
+        "CREATE TEXT SEARCH CONFIGURATION public.unaccent_simple (COPY = pg_catalog.simple)"
+    )
+    op.execute(
+        """
+        ALTER TEXT SEARCH CONFIGURATION public.unaccent_simple
+        ALTER MAPPING FOR asciiword, asciihword, hword_asciipart, word, hword, hword_part
+        WITH unaccent, simple
+        """
+    )
+    op.execute(
+        """
+        CREATE INDEX ix_videos_title_fts ON videos
+        USING gin (to_tsvector('public.unaccent_simple', coalesce(title, '')))
+        """
+    )
+
+
+def downgrade() -> None:
+    op.execute("DROP INDEX IF EXISTS ix_videos_title_fts")
+    op.execute("DROP TEXT SEARCH CONFIGURATION IF EXISTS public.unaccent_simple")

backend/app/models.py

@@ -344,6 +344,25 @@ class VideoState(Base, UpdatedAtMixin):
     progress_updated_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
 
 
+class SearchFind(Base, TimestampMixin):
+    """Per-user record of a video the user surfaced via their own live YouTube search.
+
+    Lets "videos I searched for" appear in that user's own (Mine) feed and the Mine Source
+    filter — distinct from the GLOBAL `Video.via_search` provenance, which marks a video as
+    search-discovered by *anyone* and drives the shared Library's Source filter."""
+
+    __tablename__ = "search_finds"
+    __table_args__ = (UniqueConstraint("user_id", "video_id", name="uq_user_search_video"),)
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    user_id: Mapped[int] = mapped_column(
+        ForeignKey("users.id", ondelete="CASCADE"), index=True
+    )
+    video_id: Mapped[str] = mapped_column(
+        ForeignKey("videos.id", ondelete="CASCADE"), index=True
+    )
+
+
 class ApiQuotaUsage(Base):
     """Tracks YouTube Data API units spent per Pacific-time day (the quota resets at
     midnight Pacific). The whole app shares one daily budget."""

backend/app/routes/feed.py

@@ -1,10 +1,11 @@
 import base64
 import binascii
 import json
+import re
 from datetime import date, datetime, timedelta, timezone
 
 from fastapi import APIRouter, Depends, HTTPException, Query
-from sqlalchemy import Select, and_, false, func, or_, select
+from sqlalchemy import BigInteger, Select, and_, cast, false, func, or_, select
 from sqlalchemy.dialects.postgresql import insert as pg_insert
 from sqlalchemy.orm import Session, aliased
 from sqlalchemy.orm.exc import StaleDataError
@@ -17,6 +18,7 @@ from app.models import (
     ChannelTag,
     Playlist,
     PlaylistItem,
+    SearchFind,
     Subscription,
     Tag,
     User,
@@ -153,14 +155,20 @@ def _filtered_query(
             ),
         )
     else:
-        # Only channels this user is subscribed to (and hasn't hidden).
+        # "Mine": the user's own videos = their non-hidden subscriptions OR videos they
-        query = query.join(
+        # surfaced via their own live YouTube search. Both are LEFT-joined so the Source
+        # filter below can include either or both, and the subscription row stays available
+        # for the priority sort.
+        query = query.outerjoin(
             Subscription,
             and_(
                 Subscription.channel_id == Video.channel_id,
                 Subscription.user_id == user.id,
                 Subscription.hidden.is_(False),
             ),
+        ).outerjoin(
+            SearchFind,
+            and_(SearchFind.video_id == Video.id, SearchFind.user_id == user.id),
         )
 
     query = query.outerjoin(
@@ -172,16 +180,25 @@ def _filtered_query(
     # either way they shouldn't show in any feed view meanwhile.
     query = query.where(Video.unavailable_since.is_(None))
 
-    # Provenance filter for the Library: search-discovered videos are "noise" hidden by
+    # Source filter. In the shared Library ("all" scope) it uses the GLOBAL via_search flag
-    # default ("organic"), can be mixed in ("all"), or shown exclusively ("search"). Only
+    # (search-discovered by anyone). In "my" scope it's the user's OWN provenance:
-    # meaningful in "all" scope: "my" already restricts to subscribed channels, where a
+    # "organic" = your subscriptions, "search" = videos you found via your own search,
-    # once-searched video is legitimately the user's.
+    # "all" = both. Default "organic" keeps the Mine feed = subscriptions only.
     if scope == "all":
         if library_source == "organic":
             query = query.where(Video.via_search.is_(False))
         elif library_source == "search":
             query = query.where(Video.via_search.is_(True))
         # "all" → both organic and search-discovered videos
+    else:
+        subscribed = Subscription.channel_id.isnot(None)
+        searched = SearchFind.video_id.isnot(None)
+        if library_source == "search":
+            query = query.where(searched)
+        elif library_source == "all":
+            query = query.where(or_(subscribed, searched))
+        else:  # "organic" (default): subscriptions only
+            query = query.where(subscribed)
 
     if channel_id:
         query = query.where(Video.channel_id == channel_id)
@@ -204,9 +221,32 @@ def _filtered_query(
             published_before, datetime.min.time(), tzinfo=timezone.utc
         ) + timedelta(days=1)
         query = query.where(Video.published_at < end)
+    # Full-text relevance search on the title: YouTube-like "fuzzy" matching (word-order-
+    # independent, multi-word AND, prefix on the word being typed) + accent-insensitive via
+    # the unaccent_simple config. The channel name still matches as a substring so channel
+    # searches work. `rank_expr` (ts_rank) drives the optional "relevance" sort. The
+    # to_tsvector expression must match the GIN index (migration 0031) verbatim to be used.
+    rank_expr = None
     if q:
-        # Accent-insensitive: unaccent() both sides so "tiesto" matches "Tiësto" (ILIKE alone
+        ts_str = _to_tsquery_str(q)
-        # is case- but not diacritic-insensitive). unaccent is enabled by migration 0029.
+        if ts_str:
+            tsq = func.to_tsquery("public.unaccent_simple", ts_str)
+            title_vec = func.to_tsvector(
+                "public.unaccent_simple", func.coalesce(Video.title, "")
+            )
+            query = query.where(
+                or_(
+                    title_vec.op("@@")(tsq),
+                    func.unaccent(Channel.title).ilike(func.unaccent(f"%{q}%")),
+                )
+            )
+            # Scale ts_rank (a float4) to an integer score so the keyset cursor compares it
+            # EXACTLY — a raw float4 vs the float8 cursor value mismatches on round-trip and
+            # breaks paging (the same page repeats). 1e6 granularity is ample; ties break on
+            # published_at then id.
+            rank_expr = cast(func.ts_rank(title_vec, tsq) * 1000000, BigInteger)
+        else:
+            # No usable tokens (e.g. only punctuation): fall back to a plain substring match.
             like = func.unaccent(f"%{q}%")
             query = query.where(
                 or_(
@@ -271,7 +311,19 @@ def _filtered_query(
     else:  # all
         query = query.where(status_expr != "hidden")
 
-    return query, status_expr
+    return query, status_expr, rank_expr
+
+
+def _to_tsquery_str(q: str) -> str | None:
+    """Turn free-text into a to_tsquery() string: word runs ANDed together, the LAST word
+    prefix-matched (`:*`) for as-you-type search — e.g. "ti amo magyar" → "ti & amo & magyar:*".
+    Only `\\w` runs containing an alphanumeric are kept, so no tsquery operators can leak in
+    (the string is built from sanitised tokens, never the raw query)."""
+    tokens = [t for t in re.findall(r"\w+", q, flags=re.UNICODE) if any(c.isalnum() for c in t)]
+    if not tokens:
+        return None
+    tokens[-1] = tokens[-1] + ":*"
+    return " & ".join(tokens)
 
 
 # Shared query parameters for /feed and /feed/count.
@@ -320,7 +372,7 @@ def _feed_params(
 # replaces OFFSET/LIMIT: deep scrolling no longer scans-and-discards skipped rows,
 # and the page boundary is stable even as the scheduler ingests new videos mid-scroll
 # (OFFSET would shift and duplicate/skip rows).
-def _sort_keys(sort: str, seed: int) -> list[dict]:
+def _sort_keys(sort: str, seed: int, rank_expr=None) -> list[dict]:
     pub = {"expr": Video.published_at, "asc": False, "nullable": True, "kind": "dt"}
     table: dict[str, list[dict]] = {
         "newest": [pub],
@@ -341,6 +393,13 @@ def _sort_keys(sort: str, seed: int) -> list[dict]:
         # the cursor stays valid across pages of one shuffled run.
         "shuffle": [{"expr": func.md5(func.concat(Video.id, str(seed))), "asc": True, "nullable": False, "kind": "str"}],
     }
+    # Relevance (search-result ranking) only exists when there's a query to rank against;
+    # without `rank_expr` it falls through to newest. Ties break by newest, then id.
+    if rank_expr is not None:
+        table["relevance"] = [
+            {"expr": rank_expr, "asc": False, "nullable": False, "kind": "num"},
+            pub,
+        ]
     return table.get(sort) or table["newest"]
 
 
@@ -409,8 +468,8 @@ def get_feed(
     user: User = Depends(current_user),
     db: Session = Depends(get_db),
 ) -> dict:
-    query, _status = _filtered_query(db, user, **params)
+    query, _status, rank_expr = _filtered_query(db, user, **params)
-    keys = _sort_keys(sort, seed)
+    keys = _sort_keys(sort, seed, rank_expr)
 
     # Expose each key column on the row so we can build the next cursor from the last item.
     query = query.add_columns(*[k["expr"].label(f"_k{i}") for i, k in enumerate(keys)])
@@ -439,7 +498,7 @@ def get_feed_count(
     user: User = Depends(current_user),
     db: Session = Depends(get_db),
 ) -> dict:
-    query, _status = _filtered_query(db, user, **params)
+    query, _status, _rank = _filtered_query(db, user, **params)
     total = db.scalar(select(func.count()).select_from(query.subquery()))
     return {"count": total or 0}
 
@@ -467,7 +526,7 @@ def get_facets(
         # keeps them applied, so each remaining chip narrows to channels that ALSO have all
         # already-selected topics — and tags that can't co-occur drop to zero (hidden).
         conjunctive = category == "topic" and params.get("tag_mode") == "and"
-        base, _status = _filtered_query(
+        base, _status, _rank = _filtered_query(
             db,
             user,
             **{**params, "exclude_tag_category": None if conjunctive else category},

backend/app/routes/search.py

@@ -17,12 +17,13 @@ from datetime import datetime, timezone
 
 from fastapi import APIRouter, Depends, HTTPException
 from sqlalchemy import and_, select
+from sqlalchemy.dialects.postgresql import insert as pg_insert
 from sqlalchemy.orm import Session, aliased
 
 from app import quota, sysconfig
 from app.auth import require_human
 from app.db import get_db
-from app.models import Channel, User, Video, VideoState
+from app.models import Channel, SearchFind, User, Video, VideoState
 from app.routes.feed import _serialize, feed_columns
 from app.sync.subscriptions import apply_channel_details
 from app.sync.videos import _insert_stubs, apply_video_details, parse_dt
@@ -213,6 +214,17 @@ def search_youtube(
         v.id for v in videos if not v.is_short and v.live_status not in _LIVE_HIDDEN
     }
     ordered = [vid for vid in ids if vid in keep]
+
+    # 6) Record these as THIS user's search finds so they surface in their own Mine feed
+    #    (and the Mine Source filter), independent of the global via_search flag. Idempotent.
+    if ordered:
+        db.execute(
+            pg_insert(SearchFind)
+            .values([{"user_id": user.id, "video_id": vid} for vid in ordered])
+            .on_conflict_do_nothing(index_elements=["user_id", "video_id"])
+        )
+        db.commit()
+
     return {
         "items": _serialize_ids(db, user, ordered),
         "next_cursor": page["next_page_token"],