feat: implement task dependencies with validation and update handling

2026-02-07 00:21:44 +05:30
parent 8970ee6742
commit 4bab455912
34 changed files with 1241 additions and 157 deletions
--- a/backend/alembic/versions/3c6a2d3df4a1_task_dependencies.py
+++ b/backend/alembic/versions/3c6a2d3df4a1_task_dependencies.py
@@ -0,0 +1,80 @@
+"""task dependencies
+
+Revision ID: 3c6a2d3df4a1
+Revises: 1d844b04ee06
+Create Date: 2026-02-06
+"""
+
+from __future__ import annotations
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = "3c6a2d3df4a1"
+down_revision = "1d844b04ee06"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "task_dependencies",
+        sa.Column("id", sa.Uuid(), nullable=False),
+        sa.Column("board_id", sa.Uuid(), nullable=False),
+        sa.Column("task_id", sa.Uuid(), nullable=False),
+        sa.Column("depends_on_task_id", sa.Uuid(), nullable=False),
+        sa.Column("created_at", sa.DateTime(), nullable=False),
+        sa.ForeignKeyConstraint(
+            ["board_id"],
+            ["boards.id"],
+            ondelete="CASCADE",
+        ),
+        sa.ForeignKeyConstraint(
+            ["task_id"],
+            ["tasks.id"],
+            ondelete="CASCADE",
+        ),
+        sa.ForeignKeyConstraint(
+            ["depends_on_task_id"],
+            ["tasks.id"],
+            ondelete="CASCADE",
+        ),
+        sa.PrimaryKeyConstraint("id"),
+        sa.UniqueConstraint(
+            "task_id",
+            "depends_on_task_id",
+            name="uq_task_dependencies_task_id_depends_on_task_id",
+        ),
+        sa.CheckConstraint(
+            "task_id <> depends_on_task_id",
+            name="ck_task_dependencies_no_self",
+        ),
+    )
+
+    op.create_index(
+        "ix_task_dependencies_board_id",
+        "task_dependencies",
+        ["board_id"],
+        unique=False,
+    )
+    op.create_index(
+        "ix_task_dependencies_task_id",
+        "task_dependencies",
+        ["task_id"],
+        unique=False,
+    )
+    op.create_index(
+        "ix_task_dependencies_depends_on_task_id",
+        "task_dependencies",
+        ["depends_on_task_id"],
+        unique=False,
+    )
+
+
+def downgrade() -> None:
+    op.drop_index("ix_task_dependencies_depends_on_task_id", table_name="task_dependencies")
+    op.drop_index("ix_task_dependencies_task_id", table_name="task_dependencies")
+    op.drop_index("ix_task_dependencies_board_id", table_name="task_dependencies")
+    op.drop_table("task_dependencies")
+