Fix concurrent generation threading issues

- Fix SessionLocal import error by using db_manager.get_session()
- Create thread-local ContentGenerator instances for each worker
- Ensure each thread uses its own database session
- Prevents database session conflicts in concurrent article generation

docs/stories/story-2.7-concurrent-generation-optimization.md

@@ -63,7 +63,7 @@ Implement concurrent API calls for article generation using ThreadPoolExecutor t
 - Console output shows concurrency setting at job start
 
 ### 5. Word Count Optimization
-**Status:** PENDING
+**Status:** COMPLETE
 
 - Content generation prompts compensate by adding 200 words to target
 - If `min_word_count` = 1000, prompt receives `target_word_count` = 1200

env.example

@@ -52,3 +52,8 @@ LINK_BUILDER_API_KEY=your_link_builder_api_key_here
 # Application Configuration
 LOG_LEVEL=INFO
 ENVIRONMENT=development
+
+# Concurrent Processing
+# Number of concurrent article generation workers (default: 5)
+# Set to 1 for sequential processing (useful for debugging)
+CONCURRENT_WORKERS=5

scripts/list_domains.py

@@ -0,0 +1,42 @@
+"""
+List all available FQDN domains (custom hostnames)
+
+Usage:
+    uv run python scripts/list_domains.py
+"""
+
+import sys
+from pathlib import Path
+
+project_root = Path(__file__).parent.parent
+sys.path.insert(0, str(project_root))
+
+from src.database.session import db_manager
+from src.database.models import SiteDeployment
+
+
+def list_domains():
+    """List all site deployments with custom hostnames"""
+    session = db_manager.get_session()
+    
+    try:
+        sites = session.query(SiteDeployment).filter(
+            SiteDeployment.custom_hostname.isnot(None)
+        ).order_by(SiteDeployment.site_name).all()
+        
+        print(f"\nFound {len(sites)} domains with custom hostnames:\n")
+        print(f"{'ID':<5} {'Site Name':<35} {'Custom Hostname'}")
+        print("-" * 80)
+        
+        for s in sites:
+            print(f"{s.id:<5} {s.site_name:<35} {s.custom_hostname}")
+        
+        print()
+        
+    finally:
+        session.close()
+
+
+if __name__ == "__main__":
+    list_domains()
+

src/cli/commands.py

@@ -4,7 +4,7 @@ CLI command definitions using Click
 
 import click
 from typing import Optional
-from src.core.config import get_config, get_bunny_account_api_key
+from src.core.config import get_config, get_bunny_account_api_key, get_concurrent_workers
 from src.auth.service import AuthService
 from src.database.session import db_manager
 from src.database.repositories import UserRepository, SiteDeploymentRepository, ProjectRepository
@@ -977,14 +977,20 @@ def generate_batch(
                 content_repo=content_repo
             )
             
+            max_workers = get_concurrent_workers()
+            job_max_workers = jobs[0].max_workers if jobs and jobs[0].max_workers else None
+            final_max_workers = job_max_workers or max_workers
+            
             batch_processor = BatchProcessor(
                 content_generator=content_generator,
                 content_repo=content_repo,
                 project_repo=project_repo,
-                site_deployment_repo=site_deployment_repo
+                site_deployment_repo=site_deployment_repo,
+                max_workers=final_max_workers
             )
             
             click.echo(f"\nProcessing job file: {job_file}")
+            click.echo(f"Concurrent workers: {final_max_workers}")
             if debug:
                 click.echo("Debug mode: AI responses will be saved to debug_output/\n")
             

src/core/config.py

@@ -232,3 +232,13 @@ def get_bunny_account_api_key() -> str:
     if not api_key:
         raise ValueError("BUNNY_ACCOUNT_API_KEY environment variable is required")
     return api_key
+
+
+def get_concurrent_workers() -> int:
+    """
+    Get the number of concurrent workers for article generation
+    
+    Returns:
+        Number of concurrent workers (default: 5)
+    """
+    return int(os.getenv("CONCURRENT_WORKERS", "5"))

src/generation/batch_processor.py

@@ -2,11 +2,13 @@
 Batch processor for content generation jobs
 """
 
-from typing import Dict, Any, Optional
+from typing import Dict, Any, Optional, List
 import click
 import os
 from pathlib import Path
 from datetime import datetime
+from concurrent.futures import ThreadPoolExecutor, as_completed
+from threading import Lock
 from src.generation.service import ContentGenerator
 from src.generation.job_config import JobConfig, Job, TierConfig
 from src.generation.deployment_assignment import validate_and_resolve_targets, assign_site_for_article
@@ -28,12 +30,15 @@ class BatchProcessor:
         content_generator: ContentGenerator,
         content_repo: GeneratedContentRepository,
         project_repo: ProjectRepository,
-        site_deployment_repo: Optional[SiteDeploymentRepository] = None
+        site_deployment_repo: Optional[SiteDeploymentRepository] = None,
+        max_workers: int = 5
     ):
         self.generator = content_generator
         self.content_repo = content_repo
         self.project_repo = project_repo
         self.site_deployment_repo = site_deployment_repo
+        self.max_workers = max_workers
+        self.stats_lock = Lock()
         self.stats = {
             "total_jobs": 0,
             "processed_jobs": 0,
@@ -199,8 +204,8 @@ class BatchProcessor:
         debug: bool,
         continue_on_error: bool
     ):
-        """Process all articles for a tier with pre-generated titles"""
+        """Process all articles for a tier with concurrent generation"""
-        click.echo(f"  {tier_name}: Generating {tier_config.count} articles")
+        click.echo(f"  {tier_name}: Generating {tier_config.count} articles (concurrency: {self.max_workers})")
         
         project = self.project_repo.get_by_id(project_id)
         keyword = project.main_keyword
@@ -220,58 +225,34 @@ class BatchProcessor:
             titles = [line.strip() for line in f if line.strip()]
         
         click.echo(f"[{tier_name}] Generated {len(titles)} titles")
-        click.echo(f"[{tier_name}] Titles saved to: {titles_file}")
         
         targets_for_tier = resolved_targets if tier_name == "tier1" else {}
         
+        article_tasks = []
         for article_num in range(1, tier_config.count + 1):
-            self.stats["total_articles"] += 1
             article_index = article_num - 1
             
             if article_index >= len(titles):
                 click.echo(f"    Warning: Not enough titles generated, skipping article {article_num}")
                 continue
             
-            title = titles[article_index]
+            article_tasks.append({
+                'project_id': project_id,
+                'tier_name': tier_name,
+                'tier_config': tier_config,
+                'article_num': article_num,
+                'article_index': article_index,
+                'title': titles[article_index],
+                'keyword': keyword,
+                'resolved_targets': targets_for_tier,
+                'debug': debug
+            })
         
-            try:
+        if self.max_workers > 1:
-                self._generate_single_article(
+            self._process_articles_concurrent(article_tasks, continue_on_error)
-                    project_id,
+        else:
-                    tier_name,
+            self._process_articles_sequential(article_tasks, continue_on_error)
-                    tier_config,
-                    article_num,
-                    article_index,
-                    title,
-                    keyword,
-                    targets_for_tier,
-                    debug
-                )
-                self.stats["generated_articles"] += 1
         
-            except Exception as e:
-                self.stats["failed_articles"] += 1
-                import traceback
-                click.echo(f"    [{article_num}/{tier_config.count}] FAILED: {e}")
-                click.echo(f"    Traceback: {traceback.format_exc()}")
-                
-                try:
-                    self.content_repo.create(
-                        project_id=project_id,
-                        tier=tier_name,
-                        keyword=keyword,
-                        title="Failed Generation",
-                        outline={"error": str(e)},
-                        content="",
-                        word_count=0,
-                        status="failed"
-                    )
-                except Exception as db_error:
-                    click.echo(f"    Failed to save error record: {db_error}")
-                
-                if not continue_on_error:
-                    raise
-        
-        # Post-processing: URL generation and interlinking (Story 3.1-3.3)
         try:
             self._post_process_tier(project_id, tier_name, job, debug)
         except Exception as e:
@@ -367,6 +348,206 @@ class BatchProcessor:
         
         click.echo(f"{prefix} Saved (ID: {saved_content.id}, Status: {status})")
     
+    def _process_articles_concurrent(
+        self,
+        article_tasks: List[Dict[str, Any]],
+        continue_on_error: bool
+    ):
+        """
+        Process articles concurrently using ThreadPoolExecutor
+        """
+        with ThreadPoolExecutor(max_workers=self.max_workers) as executor:
+            future_to_task = {
+                executor.submit(self._generate_single_article_thread_safe, **task): task
+                for task in article_tasks
+            }
+            
+            for future in as_completed(future_to_task):
+                task = future_to_task[future]
+                article_num = task['article_num']
+                tier_name = task['tier_name']
+                tier_config = task['tier_config']
+                
+                try:
+                    future.result()
+                    
+                    with self.stats_lock:
+                        self.stats["generated_articles"] += 1
+                        
+                except Exception as e:
+                    with self.stats_lock:
+                        self.stats["failed_articles"] += 1
+                    
+                    import traceback
+                    click.echo(f"    [{article_num}/{tier_config.count}] FAILED: {e}")
+                    click.echo(f"    Traceback: {traceback.format_exc()}")
+                    
+                    try:
+                        self.content_repo.create(
+                            project_id=task['project_id'],
+                            tier=tier_name,
+                            keyword=task['keyword'],
+                            title="Failed Generation",
+                            outline={"error": str(e)},
+                            content="",
+                            word_count=0,
+                            status="failed"
+                        )
+                    except Exception as db_error:
+                        click.echo(f"    Failed to save error record: {db_error}")
+                    
+                    if not continue_on_error:
+                        for f in future_to_task:
+                            f.cancel()
+                        raise
+    
+    def _process_articles_sequential(
+        self,
+        article_tasks: List[Dict[str, Any]],
+        continue_on_error: bool
+    ):
+        """
+        Process articles sequentially (fallback for max_workers=1)
+        """
+        for task in article_tasks:
+            with self.stats_lock:
+                self.stats["total_articles"] += 1
+            
+            try:
+                self._generate_single_article(**task)
+                with self.stats_lock:
+                    self.stats["generated_articles"] += 1
+                    
+            except Exception as e:
+                with self.stats_lock:
+                    self.stats["failed_articles"] += 1
+                
+                import traceback
+                click.echo(f"    [{task['article_num']}/{task['tier_config'].count}] FAILED: {e}")
+                click.echo(f"    Traceback: {traceback.format_exc()}")
+                
+                if not continue_on_error:
+                    raise
+    
+    def _generate_single_article_thread_safe(
+        self,
+        project_id: int,
+        tier_name: str,
+        tier_config: TierConfig,
+        article_num: int,
+        article_index: int,
+        title: str,
+        keyword: str,
+        resolved_targets: Dict[str, int],
+        debug: bool
+    ):
+        """
+        Thread-safe wrapper for article generation
+        Creates a new database session for this thread
+        """
+        with self.stats_lock:
+            self.stats["total_articles"] += 1
+        
+        from src.database.session import db_manager
+        from src.generation.service import ContentGenerator
+        
+        thread_session = db_manager.get_session()
+        
+        try:
+            thread_content_repo = GeneratedContentRepository(thread_session)
+            thread_project_repo = ProjectRepository(thread_session)
+            
+            thread_generator = ContentGenerator(
+                ai_client=self.generator.ai_client,
+                prompt_manager=self.generator.prompt_manager,
+                project_repo=thread_project_repo,
+                content_repo=thread_content_repo,
+                template_service=self.generator.template_service,
+                site_deployment_repo=self.generator.site_deployment_repo
+            )
+            
+            prefix = f"    [{article_num}/{tier_config.count}]"
+            
+            models = self.current_job.models if hasattr(self, 'current_job') and self.current_job.models else None
+            
+            site_deployment_id = assign_site_for_article(article_index, resolved_targets)
+            
+            if site_deployment_id:
+                hostname = next((h for h, id in resolved_targets.items() if id == site_deployment_id), None)
+                click.echo(f"{prefix} Assigned to site: {hostname} (ID: {site_deployment_id})")
+            
+            click.echo(f"{prefix} Using title: \"{title}\"")
+            
+            click.echo(f"{prefix} Generating outline...")
+            outline = thread_generator.generate_outline(
+                project_id=project_id,
+                title=title,
+                min_h2=tier_config.min_h2_tags,
+                max_h2=tier_config.max_h2_tags,
+                min_h3=tier_config.min_h3_tags,
+                max_h3=tier_config.max_h3_tags,
+                debug=debug,
+                model=models.outline if models else None
+            )
+            
+            h2_count = len(outline["outline"])
+            h3_count = sum(len(section.get("h3", [])) for section in outline["outline"])
+            click.echo(f"{prefix} Generated outline: {h2_count} H2s, {h3_count} H3s")
+            
+            click.echo(f"{prefix} Generating content...")
+            content = thread_generator.generate_content(
+                project_id=project_id,
+                title=title,
+                outline=outline,
+                min_word_count=tier_config.min_word_count,
+                max_word_count=tier_config.max_word_count,
+                debug=debug,
+                model=models.content if models else None
+            )
+            
+            word_count = thread_generator.count_words(content)
+            click.echo(f"{prefix} Generated content: {word_count:,} words")
+            
+            status = "generated"
+            
+            if word_count < tier_config.min_word_count:
+                click.echo(f"{prefix} Below minimum ({tier_config.min_word_count:,}), augmenting...")
+                content = thread_generator.augment_content(
+                    content=content,
+                    target_word_count=tier_config.min_word_count,
+                    debug=debug,
+                    project_id=project_id,
+                    model=models.content if models else None
+                )
+                word_count = thread_generator.count_words(content)
+                click.echo(f"{prefix} Augmented content: {word_count:,} words")
+                status = "augmented"
+                
+                with self.stats_lock:
+                    self.stats["augmented_articles"] += 1
+            
+            saved_content = thread_content_repo.create(
+                project_id=project_id,
+                tier=tier_name,
+                keyword=keyword,
+                title=title,
+                outline=outline,
+                content=content,
+                word_count=word_count,
+                status=status,
+                site_deployment_id=site_deployment_id
+            )
+            
+            thread_session.commit()
+            click.echo(f"{prefix} Saved (ID: {saved_content.id}, Status: {status})")
+            
+        except Exception as e:
+            thread_session.rollback()
+            raise
+            
+        finally:
+            thread_session.close()
+    
     def _post_process_tier(
         self,
         project_id: int,

src/generation/job_config.py

@@ -94,6 +94,7 @@ class Job:
     anchor_text_config: Optional[AnchorTextConfig] = None
     failure_config: Optional[FailureConfig] = None
     interlinking: Optional[InterlinkingConfig] = None
+    max_workers: Optional[int] = None
 
 
 class JobConfig:
@@ -288,6 +289,11 @@ class JobConfig:
                 see_also_max=see_also_max
             )
         
+        max_workers = job_data.get("max_workers")
+        if max_workers is not None:
+            if not isinstance(max_workers, int) or max_workers < 1:
+                raise ValueError("'max_workers' must be a positive integer")
+        
         return Job(
             project_id=project_id,
             tiers=tiers,
@@ -299,7 +305,8 @@ class JobConfig:
             tiered_link_count_range=tiered_link_count_range,
             anchor_text_config=anchor_text_config,
             failure_config=failure_config,
-            interlinking=interlinking
+            interlinking=interlinking,
+            max_workers=max_workers
         )
     
     def _parse_tier(self, tier_name: str, tier_data: dict) -> TierConfig: