Remove redundant existence check before DELETE in sqlite_sequence

[Copilot]

Addresses review feedback on #36 regarding unnecessary complexity in database cleanup logic.

Changes

• Removed redundant SELECT query that checked if each table exists in sqlite_sequence before attempting DELETE
• Simplified control flow by eliminating conditional check around DELETE operation
• Updated comment to clarify that DELETE succeeds regardless of row existence

Before

sequence_exists = await session.execute(
    text("SELECT name FROM sqlite_sequence WHERE name=:table_name"), {"table_name": table_name}
)
if sequence_exists.fetchone():
    await session.execute(
        text("DELETE FROM sqlite_sequence WHERE name=:table_name"), {"table_name": table_name}
    )

After

await session.execute(
    text("DELETE FROM sqlite_sequence WHERE name=:table_name"), {"table_name": table_name}
)

SQL DELETE operations are idempotent and succeed whether or not the target row exists, making the existence check purely overhead.

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[babakjahan]

LGTM