app: add SQLite schema and db helper (WAL, busy_timeout, four tables + indexes)

app/__init__.py

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+"""Bike-Tinder application package (Phase 1: data spine)."""

app/db.py

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+"""SQLite connection + schema init for Bike-Tinder.
+
+Stdlib only. The sqlite3 CLI is not installed on this host, so everything
+goes through the sqlite3 module.
+"""
+import os
+import sqlite3
+
+SCHEMA_PATH = os.path.join(os.path.dirname(__file__), 'schema.sql')
+
+
+def connect(db_path):
+    """Open a connection with WAL mode and a busy_timeout, then ensure schema."""
+    parent = os.path.dirname(os.path.abspath(db_path))
+    if parent:
+        os.makedirs(parent, exist_ok=True)
+    conn = sqlite3.connect(db_path)
+    conn.row_factory = sqlite3.Row
+    conn.execute('PRAGMA journal_mode=WAL')
+    conn.execute('PRAGMA busy_timeout=5000')
+    conn.execute('PRAGMA foreign_keys=ON')
+    return conn
+
+
+def init_db(conn):
+    """Apply schema.sql (idempotent)."""
+    with open(SCHEMA_PATH, encoding='utf-8') as fh:
+        conn.executescript(fh.read())
+    conn.commit()

app/init.py

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+"""Explicit DB init path: python3 -m app.init --db <path>."""
+import argparse
+import sys
+
+from . import db
+
+
+def main(argv=None):
+    ap = argparse.ArgumentParser(description='Initialize the Bike-Tinder DB')
+    ap.add_argument('--db', default='data/bike-tinder.sqlite3')
+    args = ap.parse_args(argv)
+    conn = db.connect(args.db)
+    db.init_db(conn)
+    conn.close()
+    print('init: schema applied to %s' % args.db)
+    return 0
+
+
+if __name__ == '__main__':
+    sys.exit(main())

app/schema.sql

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+-- Bike-Tinder v1 schema (SQLite). Locked per docs/DATA-MODEL.md.
+-- Applied by app.db.init_db(); WAL mode and busy_timeout are set there.
+
+CREATE TABLE IF NOT EXISTS listings (
+  id             INTEGER PRIMARY KEY AUTOINCREMENT,
+  region         TEXT NOT NULL CHECK (region IN ('ns','nb')),
+  src_id         TEXT NOT NULL,                    -- source ad id (Kijiji id in v1)
+  title          TEXT NOT NULL,
+  price_display  TEXT,                             -- "$5,000"; "Please Contact"
+  price_num      INTEGER,                          -- NULL when unpackable
+  km             INTEGER,                          -- NULL when not stated
+  location       TEXT,
+  url            TEXT NOT NULL,                    -- source ad page
+  img_url        TEXT,                             -- source CDN card image
+  desc           TEXT,                             -- card description snippet
+  family         TEXT,                             -- top rubric family label (taste signal)
+  score          INTEGER NOT NULL DEFAULT 0,       -- rubric score, recomputed each import
+  status         TEXT NOT NULL DEFAULT 'active' CHECK (status IN ('active','gone','dup')),
+  dup_of         INTEGER,                          -- canonical row id when status='dup'
+  first_seen     TEXT,
+  last_seen      TEXT,
+  created_at     TEXT DEFAULT (datetime('now')),
+  updated_at     TEXT,
+  UNIQUE (region, src_id)
+);
+
+CREATE INDEX IF NOT EXISTS idx_listings_deck ON listings (status, score DESC);
+CREATE INDEX IF NOT EXISTS idx_listings_dup  ON listings (dup_of) WHERE status = 'dup';
+
+CREATE TABLE IF NOT EXISTS swipes (
+  listing_id  INTEGER PRIMARY KEY REFERENCES listings(id) ON DELETE CASCADE,
+  action      TEXT NOT NULL CHECK (action IN ('like','nope','maybe')),
+  created_at  TEXT DEFAULT (datetime('now')),
+  updated_at  TEXT
+);
+
+CREATE TABLE IF NOT EXISTS import_runs (
+  id             INTEGER PRIMARY KEY AUTOINCREMENT,
+  started_at     TEXT NOT NULL,
+  ok             INTEGER NOT NULL,
+  partial        INTEGER NOT NULL DEFAULT 0,
+  src_fetched_ns INTEGER,
+  src_fetched_nb INTEGER,
+  total          INTEGER,
+  new            INTEGER,
+  gone           INTEGER,
+  dup            INTEGER,
+  error          TEXT
+);
+
+CREATE TABLE IF NOT EXISTS prefs (
+  key   TEXT PRIMARY KEY,
+  value TEXT
+);