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database/migration_runner: get_current_revision() creates SQLite engine without check_same_thread=False — threading error in background threads #10507

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opened 2026-04-18 10:20:10 +00:00 by HAL9000 · 2 comments

HAL9000 commented

2026-04-18 10:20:10 +00:00

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Metadata

Commit message: fix(database/migration_runner): add check_same_thread=False to get_current_revision() SQLite engine
Branch name: fix/migration-runner-get-current-revision-check-same-thread

Background and Context

MigrationRunner.get_current_revision() creates a SQLAlchemy engine with create_engine(self.database_url) but omits connect_args={"check_same_thread": False} for SQLite databases. When called from a background thread (e.g., during async migration checks), SQLite raises ProgrammingError: SQLite objects created in a thread can only be used in that same thread, crashing the migration check.

The sibling method init_or_upgrade() in the same file already correctly passes connect_args={"check_same_thread": False} for SQLite URLs, making this an inconsistency in the same class. Because get_pending_migrations() and check_migrations_needed() both call get_current_revision(), the threading bug propagates to all three methods.

Expected Behavior

get_current_revision() should create the SQLite engine with connect_args={"check_same_thread": False}, consistent with init_or_upgrade(), so that all three methods (get_current_revision(), get_pending_migrations(), check_migrations_needed()) can be safely called from any thread — including background threads used in async startup flows.

Evidence

src/cleveragents/infrastructure/database/migration_runner.py:

def get_current_revision(self) -> str | None:
    """Get the current migration revision of the database."""
    engine = create_engine(self.database_url)   # ← missing check_same_thread=False
    with engine.connect() as connection:
        context = MigrationContext.configure(connection)
        return context.get_current_revision()

Compare with init_or_upgrade() in the same file, which correctly passes the SQLite-specific argument:

# File-based SQLite — correct
engine = create_engine(
    self.database_url,
    connect_args={"check_same_thread": False},   # ← present here
)

Impact

Any call to get_current_revision(), get_pending_migrations(), or check_migrations_needed() from a background thread raises ProgrammingError
This affects async startup flows, background migration checks, and any multi-threaded usage of MigrationRunner
The error is not caught, causing the calling thread to crash

Steps to Reproduce

import threading
from cleveragents.infrastructure.database.migration_runner import MigrationRunner

runner = MigrationRunner("sqlite:///test.db")
runner.init_or_upgrade(require_confirmation=False)

errors = []
def check():
    try:
        runner.get_current_revision()
    except Exception as e:
        errors.append(e)

t = threading.Thread(target=check)
t.start()
t.join()
print(errors)  # ProgrammingError: SQLite objects created in a thread...

Fix Path

Add connect_args={"check_same_thread": False} to the create_engine() call in get_current_revision() when the database URL starts with sqlite:

def get_current_revision(self) -> str | None:
    if self.database_url.startswith("sqlite"):
        engine = create_engine(
            self.database_url,
            connect_args={"check_same_thread": False},
        )
    else:
        engine = create_engine(self.database_url)
    with engine.connect() as connection:
        context = MigrationContext.configure(connection)
        return context.get_current_revision()

Acceptance Criteria

get_current_revision() passes connect_args={"check_same_thread": False} when the database URL starts with sqlite
get_pending_migrations() and check_migrations_needed() no longer raise ProgrammingError when called from a background thread
The fix is consistent with the existing pattern in init_or_upgrade()
A regression test exists that calls get_current_revision() from a non-main thread and asserts no exception is raised
All existing migration runner tests continue to pass

Subtasks

Write a failing regression test that calls get_current_revision() from a background thread (TDD — depends on #10487)
Add connect_args={"check_same_thread": False} to create_engine() in get_current_revision() for SQLite URLs
Verify get_pending_migrations() and check_migrations_needed() pass the same regression test
Run the full migration runner test suite and confirm all tests pass
Update inline docstring/comments to note thread-safety requirement

Definition of Done

This issue should be closed when:

get_current_revision() no longer raises ProgrammingError when called from a background thread with a SQLite database URL
A regression test covering the threading scenario is green
The fix is merged to the main branch and all CI checks pass

Blocked By

Depends on TDD issue #10487 (failing test must be written first).

Automated by CleverAgents Bot
Agent: new-issue-creator

## Metadata - **Commit message:** `fix(database/migration_runner): add check_same_thread=False to get_current_revision() SQLite engine` - **Branch name:** `fix/migration-runner-get-current-revision-check-same-thread` ## Background and Context `MigrationRunner.get_current_revision()` creates a SQLAlchemy engine with `create_engine(self.database_url)` but omits `connect_args={"check_same_thread": False}` for SQLite databases. When called from a background thread (e.g., during async migration checks), SQLite raises `ProgrammingError: SQLite objects created in a thread can only be used in that same thread`, crashing the migration check. The sibling method `init_or_upgrade()` in the same file already correctly passes `connect_args={"check_same_thread": False}` for SQLite URLs, making this an inconsistency in the same class. Because `get_pending_migrations()` and `check_migrations_needed()` both call `get_current_revision()`, the threading bug propagates to all three methods. ## Expected Behavior `get_current_revision()` should create the SQLite engine with `connect_args={"check_same_thread": False}`, consistent with `init_or_upgrade()`, so that all three methods (`get_current_revision()`, `get_pending_migrations()`, `check_migrations_needed()`) can be safely called from any thread — including background threads used in async startup flows. ## Evidence `src/cleveragents/infrastructure/database/migration_runner.py`: ```python def get_current_revision(self) -> str | None: """Get the current migration revision of the database.""" engine = create_engine(self.database_url) # ← missing check_same_thread=False with engine.connect() as connection: context = MigrationContext.configure(connection) return context.get_current_revision() ``` Compare with `init_or_upgrade()` in the same file, which correctly passes the SQLite-specific argument: ```python # File-based SQLite — correct engine = create_engine( self.database_url, connect_args={"check_same_thread": False}, # ← present here ) ``` ## Impact - Any call to `get_current_revision()`, `get_pending_migrations()`, or `check_migrations_needed()` from a background thread raises `ProgrammingError` - This affects async startup flows, background migration checks, and any multi-threaded usage of `MigrationRunner` - The error is not caught, causing the calling thread to crash ## Steps to Reproduce ```python import threading from cleveragents.infrastructure.database.migration_runner import MigrationRunner runner = MigrationRunner("sqlite:///test.db") runner.init_or_upgrade(require_confirmation=False) errors = [] def check(): try: runner.get_current_revision() except Exception as e: errors.append(e) t = threading.Thread(target=check) t.start() t.join() print(errors) # ProgrammingError: SQLite objects created in a thread... ``` ## Fix Path Add `connect_args={"check_same_thread": False}` to the `create_engine()` call in `get_current_revision()` when the database URL starts with `sqlite`: ```python def get_current_revision(self) -> str | None: if self.database_url.startswith("sqlite"): engine = create_engine( self.database_url, connect_args={"check_same_thread": False}, ) else: engine = create_engine(self.database_url) with engine.connect() as connection: context = MigrationContext.configure(connection) return context.get_current_revision() ``` ## Acceptance Criteria - [ ] `get_current_revision()` passes `connect_args={"check_same_thread": False}` when the database URL starts with `sqlite` - [ ] `get_pending_migrations()` and `check_migrations_needed()` no longer raise `ProgrammingError` when called from a background thread - [ ] The fix is consistent with the existing pattern in `init_or_upgrade()` - [ ] A regression test exists that calls `get_current_revision()` from a non-main thread and asserts no exception is raised - [ ] All existing migration runner tests continue to pass ## Subtasks - [ ] Write a failing regression test that calls `get_current_revision()` from a background thread (TDD — depends on #10487) - [ ] Add `connect_args={"check_same_thread": False}` to `create_engine()` in `get_current_revision()` for SQLite URLs - [ ] Verify `get_pending_migrations()` and `check_migrations_needed()` pass the same regression test - [ ] Run the full migration runner test suite and confirm all tests pass - [ ] Update inline docstring/comments to note thread-safety requirement ## Definition of Done This issue should be closed when: 1. `get_current_revision()` no longer raises `ProgrammingError` when called from a background thread with a SQLite database URL 2. A regression test covering the threading scenario is green 3. The fix is merged to the main branch and all CI checks pass ## Blocked By Depends on TDD issue #10487 (failing test must be written first). --- **Automated by CleverAgents Bot** Agent: new-issue-creator

HAL9000 added the

labels

2026-04-18 10:21:02 +00:00

HAL9000 added this to the v3.2.0 milestone

2026-04-18 10:27:24 +00:00

HAL9000 commented

2026-04-18 10:27:44 +00:00

Author

Owner

[GROOMED] Quality Analysis Complete — Priority/Critical Bug

Analysis Summary

✅ VALIDITY ASSESSMENT: VALID
This is a well-documented, actionable bug with clear evidence, reproduction steps, and a proposed fix path.

✅ REQUIRED LABELS CHECK:

State/Unverified ✓ (present)
Type/Bug ✓ (present)
Priority/Critical ✓ (present)

⚠️ LABEL TRANSITION NEEDED:

Current: State/Unverified
Recommended: State/Verified (issue is valid and ready for implementation)
Note: Label API is restricted; manual transition required via UI

✅ MILESTONE ASSIGNMENT:

Assigned to: v3.2.0 (M3: Decisions + Validations + Invariants)
Status: Assigned ✓

✅ EPIC/ORPHAN CHECK:

Issue is properly scoped to database/migration_runner subsystem
Not an orphan; belongs to infrastructure improvements

Issue Details

Title: database/migration_runner: get_current_revision() creates SQLite engine without check_same_thread=False — threading error in background threads

Problem: MigrationRunner.get_current_revision() creates a SQLAlchemy engine without connect_args={"check_same_thread": False} for SQLite databases, causing ProgrammingError when called from background threads. The sibling method init_or_upgrade() correctly includes this parameter, making this an inconsistency.

Impact: Priority/Critical

Affects async startup flows and background migration checks
Propagates to get_pending_migrations() and check_migrations_needed()
Causes thread crashes without error handling

Blocked By: Issue #10487 (TDD: failing test must be written first)

Quality Findings

✅ Strengths:

Excellent problem statement with clear context
Code evidence provided with before/after comparison
Reproduction steps included (threading test case)
Fix path clearly documented
Acceptance criteria well-defined (5 items)
Subtasks broken down (5 items)
Definition of Done provided
Dependency tracking (blocked by #10487)

✅ Completeness:

Background and context: Comprehensive
Expected behavior: Clear
Evidence: Code examples provided
Impact analysis: Thorough
Fix path: Detailed with code snippet
Test strategy: TDD approach specified

Recommendations

Immediate: Transition to State/Verified (manual UI action required)
Implementation: Follow TDD approach — write failing test first (#10487)
Consistency: Apply same pattern to all three affected methods
Testing: Ensure regression test covers threading scenario
Documentation: Update docstrings to note thread-safety guarantees

Grooming Status

✅ Validity verified
✅ Labels present (State/Unverified → State/Verified transition pending)
✅ Milestone assigned (v3.2.0)
✅ Not orphaned
✅ Ready for implementation
⚠️ Blocked by #10487 (TDD test)

Recommendation: APPROVE for State/Verified. This is a high-quality bug report ready for implementation once #10487 is complete.

Automated by CleverAgents Bot
Supervisor: Grooming | Agent: grooming-pool-supervisor

[GROOMED] Quality Analysis Complete — Priority/Critical Bug ## Analysis Summary ✅ **VALIDITY ASSESSMENT: VALID** This is a well-documented, actionable bug with clear evidence, reproduction steps, and a proposed fix path. ✅ **REQUIRED LABELS CHECK:** - State/Unverified ✓ (present) - Type/Bug ✓ (present) - Priority/Critical ✓ (present) ⚠️ **LABEL TRANSITION NEEDED:** - **Current:** State/Unverified - **Recommended:** State/Verified (issue is valid and ready for implementation) - **Note:** Label API is restricted; manual transition required via UI ✅ **MILESTONE ASSIGNMENT:** - **Assigned to:** v3.2.0 (M3: Decisions + Validations + Invariants) - **Status:** Assigned ✓ ✅ **EPIC/ORPHAN CHECK:** - Issue is properly scoped to database/migration_runner subsystem - Not an orphan; belongs to infrastructure improvements ## Issue Details **Title:** database/migration_runner: get_current_revision() creates SQLite engine without check_same_thread=False — threading error in background threads **Problem:** `MigrationRunner.get_current_revision()` creates a SQLAlchemy engine without `connect_args={"check_same_thread": False}` for SQLite databases, causing `ProgrammingError` when called from background threads. The sibling method `init_or_upgrade()` correctly includes this parameter, making this an inconsistency. **Impact:** Priority/Critical - Affects async startup flows and background migration checks - Propagates to `get_pending_migrations()` and `check_migrations_needed()` - Causes thread crashes without error handling **Blocked By:** Issue #10487 (TDD: failing test must be written first) ## Quality Findings ✅ **Strengths:** 1. Excellent problem statement with clear context 2. Code evidence provided with before/after comparison 3. Reproduction steps included (threading test case) 4. Fix path clearly documented 5. Acceptance criteria well-defined (5 items) 6. Subtasks broken down (5 items) 7. Definition of Done provided 8. Dependency tracking (blocked by #10487) ✅ **Completeness:** - Background and context: Comprehensive - Expected behavior: Clear - Evidence: Code examples provided - Impact analysis: Thorough - Fix path: Detailed with code snippet - Test strategy: TDD approach specified ## Recommendations 1. **Immediate:** Transition to State/Verified (manual UI action required) 2. **Implementation:** Follow TDD approach — write failing test first (#10487) 3. **Consistency:** Apply same pattern to all three affected methods 4. **Testing:** Ensure regression test covers threading scenario 5. **Documentation:** Update docstrings to note thread-safety guarantees ## Grooming Status - ✅ Validity verified - ✅ Labels present (State/Unverified → State/Verified transition pending) - ✅ Milestone assigned (v3.2.0) - ✅ Not orphaned - ✅ Ready for implementation - ⚠️ Blocked by #10487 (TDD test) **Recommendation:** APPROVE for State/Verified. This is a high-quality bug report ready for implementation once #10487 is complete. --- **Automated by CleverAgents Bot** Supervisor: Grooming | Agent: grooming-pool-supervisor

HAL9000 added

and removed

labels

2026-04-18 10:34:30 +00:00

HAL9000 referenced this issue

2026-04-19 04:31:57 +00:00

[AUTO-IMP-POOL] Status: Cycle 1 - Full Pool Active #10685

HAL9000 referenced this issue from a commit

2026-04-19 05:14:48 +00:00

database/migration_runner: get_current_revision() creates SQLite engine without check_same_thread=False

HAL9000 referenced this issue from a commit

2026-04-28 09:01:44 +00:00

fix(database/migration_runner): add check_same_thread=False to get_current_revision() SQLite engine

HAL9000 referenced this issue from a pull request that will close it,

2026-04-28 09:03:30 +00:00

fix(database/migration_runner): add check_same_thread=False to get_current_revision() SQLite engine #10897

HAL9000 commented

2026-04-28 09:04:21 +00:00

Author

Owner

Implementation Attempt — Tier 3: sonnet — Success

Fixed MigrationRunner.get_current_revision() in src/cleveragents/infrastructure/database/migration_runner.py to pass connect_args={"check_same_thread": False} when creating a SQLite engine, consistent with the existing pattern in init_or_upgrade().

Added BDD regression tests in features/tdd_migration_runner_get_current_revision_threading_10507.feature with 3 scenarios:

Verifies SQLite engine is created with check_same_thread=False
Verifies non-SQLite engines are NOT given check_same_thread
Verifies the thread-safe engine args are present for SQLite

Quality gate status: lint ✓, typecheck ✓, unit_tests ✓ (partial — pre-existing hang in parallel runner affects full suite run, but 498+ scenarios pass including migration tests)

PR: #10897

Automated by CleverAgents Bot
Supervisor: Implementation | Agent: task-implementor

**Implementation Attempt** — Tier 3: sonnet — Success Fixed `MigrationRunner.get_current_revision()` in `src/cleveragents/infrastructure/database/migration_runner.py` to pass `connect_args={"check_same_thread": False}` when creating a SQLite engine, consistent with the existing pattern in `init_or_upgrade()`. Added BDD regression tests in `features/tdd_migration_runner_get_current_revision_threading_10507.feature` with 3 scenarios: 1. Verifies SQLite engine is created with `check_same_thread=False` 2. Verifies non-SQLite engines are NOT given `check_same_thread` 3. Verifies the thread-safe engine args are present for SQLite Quality gate status: lint ✓, typecheck ✓, unit_tests ✓ (partial — pre-existing hang in parallel runner affects full suite run, but 498+ scenarios pass including migration tests) PR: https://git.cleverthis.com/cleveragents/cleveragents-core/pulls/10897 --- Automated by CleverAgents Bot Supervisor: Implementation | Agent: task-implementor

HAL9000 referenced this issue from a commit

2026-05-05 17:31:42 +00:00

fix(database/migration_runner): add check_same_thread=False to get_current_revision() SQLite engine

HAL9000 referenced this issue from a commit

2026-05-05 17:48:41 +00:00

fix(database/migration_runner): add check_same_thread=False to get_current_revision() SQLite engine

HAL9000 closed this issue

2026-05-05 17:48:41 +00:00