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"""SQLite watchlist persistence for one local default profile."""
from __future__ import annotations
import sqlite3
from datetime import datetime, timezone
from pathlib import Path
DEFAULT_DB_PATH = Path(__file__).resolve().parents[2] / "data" / "prism.db"
WATCHLIST_LIMIT = 10
class WatchlistFullError(ValueError):
"""Raised when the local watchlist already has the maximum number of symbols."""
def normalize_symbol(symbol: str) -> str:
cleaned = str(symbol or "").strip().upper()
if not cleaned:
raise ValueError("symbol is required")
if len(cleaned) > 16:
raise ValueError("symbol is too long")
return cleaned
def connect(db_path: Path | str = DEFAULT_DB_PATH) -> sqlite3.Connection:
path = Path(db_path)
path.parent.mkdir(parents=True, exist_ok=True)
conn = sqlite3.connect(path)
conn.row_factory = sqlite3.Row
return conn
def init_db(db_path: Path | str = DEFAULT_DB_PATH) -> None:
with connect(db_path) as conn:
conn.execute(
"""
CREATE TABLE IF NOT EXISTS profiles (
id INTEGER PRIMARY KEY,
name TEXT UNIQUE NOT NULL
)
"""
)
conn.execute(
"""
CREATE TABLE IF NOT EXISTS watchlist (
profile_id INTEGER NOT NULL,
symbol TEXT NOT NULL,
created_at TEXT NOT NULL,
UNIQUE(profile_id, symbol),
FOREIGN KEY(profile_id) REFERENCES profiles(id)
)
"""
)
conn.execute("INSERT OR IGNORE INTO profiles(name) VALUES (?)", ("default",))
def get_default_profile_id(conn: sqlite3.Connection) -> int:
row = conn.execute("SELECT id FROM profiles WHERE name = ?", ("default",)).fetchone()
if row is None:
conn.execute("INSERT INTO profiles(name) VALUES (?)", ("default",))
row = conn.execute("SELECT id FROM profiles WHERE name = ?", ("default",)).fetchone()
return int(row["id"])
def list_symbols(db_path: Path | str = DEFAULT_DB_PATH) -> list[dict[str, str]]:
init_db(db_path)
with connect(db_path) as conn:
profile_id = get_default_profile_id(conn)
rows = conn.execute(
"SELECT symbol, created_at FROM watchlist WHERE profile_id = ? ORDER BY created_at ASC",
(profile_id,),
).fetchall()
return [{"symbol": row["symbol"], "created_at": row["created_at"]} for row in rows]
def add_symbol(symbol: str, db_path: Path | str = DEFAULT_DB_PATH) -> dict[str, str]:
sym = normalize_symbol(symbol)
init_db(db_path)
with connect(db_path) as conn:
profile_id = get_default_profile_id(conn)
existing = conn.execute(
"SELECT symbol, created_at FROM watchlist WHERE profile_id = ? AND symbol = ?",
(profile_id, sym),
).fetchone()
if existing:
return {"symbol": existing["symbol"], "created_at": existing["created_at"]}
count = conn.execute("SELECT COUNT(*) AS c FROM watchlist WHERE profile_id = ?", (profile_id,)).fetchone()["c"]
if int(count) >= WATCHLIST_LIMIT:
raise WatchlistFullError("watchlist limit reached")
created_at = datetime.now(timezone.utc).isoformat()
conn.execute(
"INSERT INTO watchlist(profile_id, symbol, created_at) VALUES (?, ?, ?)",
(profile_id, sym, created_at),
)
return {"symbol": sym, "created_at": created_at}
def remove_symbol(symbol: str, db_path: Path | str = DEFAULT_DB_PATH) -> bool:
sym = normalize_symbol(symbol)
init_db(db_path)
with connect(db_path) as conn:
profile_id = get_default_profile_id(conn)
cur = conn.execute("DELETE FROM watchlist WHERE profile_id = ? AND symbol = ?", (profile_id, sym))
return cur.rowcount > 0
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