feat(database): Implement comprehensive database management for TDocs and meetings (13a24496) · Commits · Jan Reimes / 3gpp-crawler

docs/history/2025-10-22_SUMMARY_02_DATABASE_REFACTORING.md

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		# Database Refactoring - October 22, 2025

		## Overview

		Successfully refactored the monolithic `database.py` file (808 lines) into an organized submodule structure with 9 focused files, following the same pattern as the earlier CLI refactoring.

		## Changes Made

		### Files Deleted

		- `src/tdoc_crawler/database.py` (808 lines)
		- Contained: DatabaseError class, TDocDatabase class (~25 methods), static converters, schema initialization

		### Files Created (Database Submodule)

		#### 1. `src/tdoc_crawler/database/__init__.py` (86 lines)

		- Public API exports for backward compatibility
		- Re-exports all major functions and classes
		- Maintains existing import patterns

		#### 2. `src/tdoc_crawler/database/errors.py` (28 lines)

		- DatabaseError exception class
		- Factory methods: connection_not_open(), crawl_log_persist_failed(), parse_failure(), missing_datetime()

		#### 3. `src/tdoc_crawler/database/converters.py` (36 lines)

		- Date/datetime conversion utilities
		- Functions: date_to_text(), datetime_to_text(), text_to_date(), text_to_datetime(), text_to_datetime_required()

		#### 4. `src/tdoc_crawler/database/schema.py` (228 lines)

		- SQLite connection configuration (PRAGMAs)
		- Schema initialization with 5 tables: schema_meta, working_groups, subworking_groups, meetings, tdocs, crawl_log
		- NEW: Reference data population for working_groups and subworking_groups tables

		#### 5. `src/tdoc_crawler/database/logging.py` (93 lines)

		- Crawl operation tracking
		- Functions: log_crawl_start(), log_crawl_end()

		#### 6. `src/tdoc_crawler/database/meetings.py` (305 lines)

		- Meeting CRUD operations
		- Functions: upsert_meeting(), bulk_upsert_meetings(), query_meetings(), get_existing_meeting_ids(), get_subgroup_by_code(), row_to_meeting_metadata()

		#### 7. `src/tdoc_crawler/database/tdocs.py` (495 lines)

		- TDoc CRUD operations (largest module)
		- Functions: upsert_tdoc(), bulk_upsert_tdocs(), query_tdocs(), get_existing_tdoc_ids(), get_processed_meetings(), cache_invalid_tdoc(), get_cached_invalid_tdocs(), row_to_tdoc_metadata()

		#### 8. `src/tdoc_crawler/database/statistics.py` (98 lines)

		- Database statistics gathering
		- DatabaseStatistics dataclass
		- Function: get_statistics()

		#### 9. `src/tdoc_crawler/database/connection.py` (205 lines)

		- TDocDatabase context manager class
		- Wrapper methods for all database operations
		- Delegates to specialized submodules
		- Maintains backward compatibility

		## Implementation Patterns

		### Separation of Concerns

		- connection.py: Only manages database connections and provides unified API
		- schema.py: Only handles database initialization and configuration
		- errors.py: Only defines exception classes
		- converters.py: Only provides data type conversions
		- logging.py: Only handles crawl logging
		- meetings.py: Only meeting-related operations
		- tdocs.py: Only TDoc-related operations
		- statistics.py: Only statistics and reporting

		### Backward Compatibility

		- All imports remain unchanged: `from tdoc_crawler.database import TDocDatabase`
		- The `__init__.py` re-exports all public symbols
		- Existing code requires zero modifications
		- Statistics returned as dict (for backward compatibility with CLI)

		### Key Improvements

		1. Better maintainability: Each file has a single responsibility
		2. Respects coding guidelines: No file exceeds 500 lines
		3. Reference data auto-population: Working groups and subgroups are populated from model definitions at schema initialization
		4. Clear API: TDocDatabase class provides intuitive wrapper methods

		## Testing

		### Test Results

		- 61/63 tests passing (97% pass rate)
		- 0 new test failures (2 pre-existing failures in targeted_fetch unrelated to database refactoring)
		- All database tests passing:
		- test_database.py: 13/13 ✓
		- test_cli.py: 17/17 ✓
		- test_crawler.py: 6/6 ✓
		- test_models.py: 10/10 ✓
		- test_portal_auth.py: 3/3 ✓

		### Verification

		- Ran full test suite after deletion of `database.py`
		- No import errors
		- All database operations work correctly
		- CLI commands execute without errors

		## Migration Notes

		### For Developers

		- No code changes required for existing imports
		- New code can import from `tdoc_crawler.database` as before
		- If needed, specific modules can be imported: `from tdoc_crawler.database.tdocs import query_tdocs`

		### For Users

		- No user-facing changes
		- All CLI commands continue to work as expected
		- Database file format unchanged (backward compatible)

		## Comparison: Before vs After

		\| Aspect \| Before \| After \|
		\|--------\|--------\|-------\|
		\| Files \| 1 monolithic (808 lines) \| 9 focused files (230-495 lines each) \|
		\| Organization \| Single class with mixed concerns \| Clear separation by responsibility \|
		\| Maintainability \| Difficult to modify individual operations \| Easy to understand and modify specific features \|
		\| Testing \| Large surface area for mocking \| Easier to test individual components \|
		\| Code reuse \| Limited \| Better module organization allows reuse \|

		## Related Changes

		This refactoring complements the earlier CLI refactoring:

		- CLI: Split monolithic `cli.py` (862 lines) → `cli/` submodule with 5 focused files ✓
		- Database: Split monolithic `database.py` (808 lines) → `database/` submodule with 9 focused files ✓

		Both follow the updated coding guidelines on maximum module size (500 lines).

		## Conclusion

		The database refactoring successfully improves code organization and maintainability without breaking any existing functionality. The modular structure makes future enhancements and bug fixes significantly easier to implement and test.

src/tdoc_crawler/database.py

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src/tdoc_crawler/database/init.py

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		"""Database layer for TDoc metadata storage and retrieval.

		This submodule provides organized database operations:
		- connection: TDocDatabase context manager
		- errors: DatabaseError exception
		- schema: Database initialization
		- converters: Date/datetime utilities
		- logging: Crawl operation tracking
		- meetings: Meeting CRUD operations
		- tdocs: TDoc CRUD operations
		- statistics: Database statistics and reporting
		"""

		from tdoc_crawler.database.connection import TDocDatabase
		from tdoc_crawler.database.converters import (
		date_to_text,
		datetime_to_text,
		text_to_date,
		text_to_datetime,
		text_to_datetime_required,
		)
		from tdoc_crawler.database.errors import DatabaseError
		from tdoc_crawler.database.logging import log_crawl_end, log_crawl_start
		from tdoc_crawler.database.meetings import (
		bulk_upsert_meetings,
		get_existing_meeting_ids,
		get_subgroup_by_code,
		query_meetings,
		row_to_meeting_metadata,
		upsert_meeting,
		)
		from tdoc_crawler.database.schema import configure_connection, initialize_schema
		from tdoc_crawler.database.statistics import DatabaseStatistics, get_statistics
		from tdoc_crawler.database.tdocs import (
		bulk_upsert_tdocs,
		cache_invalid_tdoc,
		get_cached_invalid_tdocs,
		get_existing_tdoc_ids,
		get_processed_meetings,
		query_tdocs,
		row_to_tdoc_metadata,
		upsert_tdoc,
		)

		__all__ = [
		# Connection manager
		"TDocDatabase",
		# Exceptions
		"DatabaseError",
		# Schema initialization
		"configure_connection",
		"initialize_schema",
		# Converters
		"date_to_text",
		"datetime_to_text",
		"text_to_date",
		"text_to_datetime",
		"text_to_datetime_required",
		# Crawl logging
		"log_crawl_start",
		"log_crawl_end",
		# Meeting operations
		"upsert_meeting",
		"bulk_upsert_meetings",
		"query_meetings",
		"get_existing_meeting_ids",
		"get_subgroup_by_code",
		"row_to_meeting_metadata",
		# TDoc operations
		"upsert_tdoc",
		"bulk_upsert_tdocs",
		"query_tdocs",
		"get_existing_tdoc_ids",
		"get_processed_meetings",
		"cache_invalid_tdoc",
		"get_cached_invalid_tdocs",
		"row_to_tdoc_metadata",
		# Statistics
		"DatabaseStatistics",
		"get_statistics",
		]

src/tdoc_crawler/database/connection.py

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		"""Database connection management."""

		from __future__ import annotations

		import sqlite3
		from collections.abc import Iterable
		from pathlib import Path
		from types import TracebackType

		from tdoc_crawler.database import logging as db_logging
		from tdoc_crawler.database import meetings as db_meetings
		from tdoc_crawler.database import statistics as db_statistics
		from tdoc_crawler.database import tdocs as db_tdocs
		from tdoc_crawler.database.errors import DatabaseError
		from tdoc_crawler.database.schema import configure_connection, initialize_schema
		from tdoc_crawler.models import (
		MeetingMetadata,
		MeetingQueryConfig,
		QueryConfig,
		TDocMetadata,
		WorkingGroup,
		)


		class TDocDatabase:
		"""Context manager for TDoc database operations.

		This class provides a high-level API for all database operations,
		delegating to specialized modules for implementation.

		Usage:
		with TDocDatabase(db_path) as database:
		database.upsert_tdoc(metadata)
		results = database.query_tdocs(config)
		"""

		def __init__(self, db_path: Path) -> None:
		"""Initialize database connection.

		Args:
		db_path: Path to SQLite database file
		"""
		self.db_path = db_path
		self._connection: sqlite3.Connection \| None = None

		def __enter__(self) -> TDocDatabase:
		"""Enter context manager and open database connection.

		Returns:
		Self with active connection

		Raises:
		DatabaseError: If connection fails
		"""
		try:
		self.db_path.parent.mkdir(parents=True, exist_ok=True)
		self._connection = sqlite3.connect(
		self.db_path,
		detect_types=sqlite3.PARSE_DECLTYPES \| sqlite3.PARSE_COLNAMES,
		check_same_thread=False,
		)
		self._connection.row_factory = sqlite3.Row
		configure_connection(self._connection)
		initialize_schema(self._connection)
		except sqlite3.Error as exc:
		raise DatabaseError(f"Database connection failed: {exc}") from exc
		else:
		return self

		def __exit__(
		self,
		exc_type: type[BaseException] \| None,
		exc_val: BaseException \| None,
		exc_tb: TracebackType \| None,
		) -> None:
		"""Exit context manager and close database connection.

		Args:
		exc_type: Exception type if error occurred
		exc_val: Exception value if error occurred
		exc_tb: Exception traceback if error occurred
		"""
		if self._connection is not None:
		self._connection.close()
		self._connection = None

		@property
		def connection(self) -> sqlite3.Connection:
		"""Get active database connection.

		Returns:
		SQLite connection

		Raises:
		DatabaseError: If connection not open
		"""
		if self._connection is None:
		raise DatabaseError.connection_not_open()
		return self._connection

		# TDoc operations
		def upsert_tdoc(self, metadata: TDocMetadata) -> tuple[bool, bool]:
		"""Insert or update a TDoc record."""
		return db_tdocs.upsert_tdoc(self.connection, metadata)

		def bulk_upsert_tdocs(self, tdocs: Iterable[TDocMetadata]) -> tuple[int, int]:
		"""Bulk insert or update TDoc records."""
		return db_tdocs.bulk_upsert_tdocs(self.connection, tdocs)

		def query_tdocs(self, config: QueryConfig) -> list[TDocMetadata]:
		"""Query TDocs with filters and sorting."""
		return db_tdocs.query_tdocs(self.connection, config)

		def get_existing_tdoc_ids(self, working_groups: Iterable[WorkingGroup] \| None = None) -> set[str]:
		"""Get all existing TDoc IDs."""
		return db_tdocs.get_existing_tdoc_ids(self.connection, working_groups)

		def get_processed_meetings(
		self,
		working_groups: Iterable[WorkingGroup] \| None = None,
		subgroups: Iterable[str] \| None = None,
		) -> set[int]:
		"""Get meeting IDs that have been crawled for TDocs."""
		return db_tdocs.get_processed_meetings(self.connection, working_groups, subgroups)

		def cache_invalid_tdoc(
		self,
		tdoc_id: str,
		url: str,
		working_group: WorkingGroup,
		subgroup: str,
		) -> None:
		"""Cache a TDoc that failed portal validation."""
		db_tdocs.cache_invalid_tdoc(self.connection, tdoc_id, url, working_group, subgroup)

		def get_cached_invalid_tdocs(self) -> set[str]:
		"""Get all TDoc IDs that have been cached as invalid."""
		return db_tdocs.get_cached_invalid_tdocs(self.connection)

		# Meeting operations
		def upsert_meeting(self, metadata: MeetingMetadata) -> tuple[bool, bool]:
		"""Insert or update a meeting record."""
		return db_meetings.upsert_meeting(self.connection, metadata)

		def bulk_upsert_meetings(self, meetings: Iterable[MeetingMetadata]) -> tuple[int, int]:
		"""Bulk insert or update meeting records."""
		return db_meetings.bulk_upsert_meetings(self.connection, meetings)

		def query_meetings(self, config: MeetingQueryConfig) -> list[MeetingMetadata]:
		"""Query meetings with filters and sorting."""
		return db_meetings.query_meetings(self.connection, config)

		def get_existing_meeting_ids(self, working_groups: Iterable[WorkingGroup] \| None = None) -> set[int]:
		"""Get all existing meeting IDs."""
		return db_meetings.get_existing_meeting_ids(self.connection, working_groups)

		def get_subgroup_by_code(self, code: str) -> dict \| None:
		"""Get subgroup information by code."""
		return db_meetings.get_subgroup_by_code(self.connection, code)

		# Crawl logging
		def log_crawl_start(
		self,
		crawl_type: str,
		working_groups: Iterable[WorkingGroup] \| None = None,
		incremental: bool = False,
		) -> int:
		"""Log the start of a crawl operation."""
		wg_list = working_groups if working_groups is not None else []
		return db_logging.log_crawl_start(self.connection, crawl_type, wg_list, incremental)

		def log_crawl_end(
		self,
		crawl_id: int,
		*,
		items_added: int,
		items_updated: int,
		errors_count: int,
		status: str = "COMPLETED",
		) -> None:
		"""Log the end of a crawl operation."""
		db_logging.log_crawl_end(
		self.connection,
		crawl_id,
		items_added=items_added,
		items_updated=items_updated,
		errors_count=errors_count,
		status=status,
		)

		# Statistics
		def get_statistics(self) -> dict:
		"""Get comprehensive database statistics (as dict for backward compatibility)."""
		from dataclasses import asdict

		stats = db_statistics.get_statistics(self.connection)
		result = asdict(stats)
		# Rename field for backward compatibility
		result["by_working_group"] = result.pop("working_group_breakdown")
		return result

src/tdoc_crawler/database/converters.py

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		"""Date and datetime conversion utilities."""

		from __future__ import annotations

		from datetime import date, datetime

		from tdoc_crawler.database.errors import DatabaseError


		def date_to_text(value: date \| None) -> str \| None:
		"""Convert date to ISO format text."""
		return value.isoformat() if value is not None else None


		def datetime_to_text(value: datetime \| None) -> str \| None:
		"""Convert datetime to ISO format text."""
		return value.isoformat() if value is not None else None


		def text_to_datetime(value: str \| None) -> datetime \| None:
		"""Convert ISO format text to datetime."""
		return datetime.fromisoformat(value) if value is not None else None


		def text_to_datetime_required(value: str \| None) -> datetime:
		"""Convert ISO format text to datetime, raise if None."""
		dt_value = text_to_datetime(value)
		if dt_value is None:
		raise DatabaseError.missing_datetime()
		return dt_value


		def text_to_date(value: str \| None) -> date \| None:
		"""Convert ISO format text to date."""
		return date.fromisoformat(value) if value is not None else None