SQLite

SQLite sink

Persist filings, document payloads, coverage rows, and graph edges to a local SQLite file.

• License: Public domain — OSI-approved open source.
• Driver: the Python standard library (sqlite3) — no extra required.
• Extra: none.

Install

Nothing beyond the base install:

pip install .

Configure

DATABASE_TARGET=sqlite
SQLITE_PATH=hkex.db            # a filesystem path…
# SQLITE_PATH=:memory:         # …or an ephemeral in-memory database

Run it:

hkex-scraper --database-target sqlite --limit 100

The schema is created automatically on startup (CREATE TABLE IF NOT EXISTS and CREATE INDEX IF NOT EXISTS). No manual DDL.

Schema

Same tables and keys as every relational sink (see Sinks#shared-schema). Datetimes are stored as ISO-8601 text and JSON fields (document_tables, referenced_tickers) as JSON text.

Query it with the sqlite3 CLI or any SQLite client:

SELECT company_ticker, count(*) FROM exchange_filing GROUP BY 1 ORDER BY 2 DESC LIMIT 10;

SELECT filing_id, title
FROM exchange_filing
WHERE referenced_tickers LIKE '%0700.HK%';

SELECT filing_id, json_extract(tbl.value, '$.markdown')
FROM exchange_filing, json_each(document_tables) AS tbl
WHERE filing_type = 'Annual Report';

Notes and limitations

• Single writer: SQLite serialises writes. It is ideal for local analysis, CI, and small deployments; for concurrent production ingestion prefer PostgreSQL or MySQL.
• Upserts use ON CONFLICT DO UPDATE; edges use ON CONFLICT DO NOTHING, so re-runs are idempotent.
• No GIN-style indexes: JSON columns are stored as text; use json_extract/json_each in queries rather than indexed containment.
• Foreign keys are enabled (PRAGMA foreign_keys = ON).
• Tests: SQLite needs no service, so the sink has in-process integration tests that run on every pytest invocation (see tests/test_sqlite_integration.py).

Troubleshooting

Symptom	Cause	Fix
SQLite sink requires SQLITE_PATH	Path not set	Set SQLITE_PATH (or :memory:)
unable to open database file	Directory does not exist / not writable	Create the directory or use an absolute writable path
database is locked	A second writer holds the file	Ensure one scraper process per database file

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