fix: Fix connection encoding (#1917)

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## Description
Resolve issue with special characters like '#' and '@' in passwords for
Postgres

## Acceptance Criteria
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- [ ] Bug fix (non-breaking change that fixes an issue)
- [ ] New feature (non-breaking change that adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update
- [ ] Code refactoring
- [ ] Performance improvement
- [ ] Other (please specify):

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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Refactor**
* Improved internal database connection handling for relational and
vector databases to enhance system stability and code maintainability.

<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

cognee/infrastructure/databases/relational/create_relational_engine.py

@@ -1,3 +1,4 @@
+from sqlalchemy import URL
 from .sqlalchemy.SqlAlchemyAdapter import SQLAlchemyAdapter
 from functools import lru_cache
 
@@ -45,9 +46,16 @@ def create_relational_engine(
             # Test if asyncpg is available
             import asyncpg
 
-            connection_string = (
-                f"postgresql+asyncpg://{db_username}:{db_password}@{db_host}:{db_port}/{db_name}"
+            # Handle special characters in username and password like # or @
+            connection_string = URL.create(
+                "postgresql+asyncpg",
+                username=db_username,
+                password=db_password,
+                host=db_host,
+                port=int(db_port),
+                database=db_name,
             )
+
         except ImportError:
             raise ImportError(
                 "PostgreSQL dependencies are not installed. Please install with 'pip install cognee\"[postgres]\"' or 'pip install cognee\"[postgres-binary]\"' to use PostgreSQL functionality."

cognee/infrastructure/databases/vector/create_vector_engine.py

@@ -1,3 +1,5 @@
+from sqlalchemy import URL
+
 from .supported_databases import supported_databases
 from .embeddings import get_embedding_engine
 from cognee.infrastructure.databases.graph.config import get_graph_context_config
@@ -66,8 +68,13 @@ def create_vector_engine(
         if not (db_host and db_port and db_name and db_username and db_password):
             raise EnvironmentError("Missing requred pgvector credentials!")
 
-        connection_string: str = (
-            f"postgresql+asyncpg://{db_username}:{db_password}@{db_host}:{db_port}/{db_name}"
+        connection_string = URL.create(
+            "postgresql+asyncpg",
+            username=db_username,
+            password=db_password,
+            host=db_host,
+            port=int(db_port),
+            database=db_name,
         )
 
         try: