Make listing fields required and remove orphan executable contracts

[purplesmoke05]

📌 Description

This pull request enforces non-null constraints on key columns in the listing table and audit columns (created, modified) across multiple tables, updates the SQLAlchemy models to reflect these constraints, and removes now-unnecessary runtime assertions.

✅ Related Issues

• Close [REFACTOR] Make listing records non-nullable across admin and issuer token flows #1792

🔄 Changes

Database schema and migration changes:

• Added a migration (4df7e2c1b8a3_v26_6_0_feature_1792.py) that backfills created and modified columns with the current timestamp where they are null, and alters these columns (as well as listing.token_address, listing.is_public, and listing.owner_address) to be non-nullable across all relevant tables. It also cleans up invalid data in listing and related tables.

• Updated the Listing model to make token_address, is_public, and owner_address non-nullable, and removed the assertion that created is not None in its json method.

• Updated the created and modified columns in Base, Company, and Notification models to be non-nullable.

API and codebase cleanup:

• Removed runtime assertions checking for non-null values of token_address, is_public, owner_address, and created in several API endpoints, as these are now enforced at the schema level.

📌 Checklist

• I have added tests where necessary.
• I have updated the documentation where necessary.

[github-actions]

Coverage Report •

File	Stmts	Miss	Branch	BrPart	Cover	Missing
app/api/routers
admin.py	162	30	56	24	81%	93–95, 106, 152, 224–232, 234–236, 250, 253–254, 256, 281, 320, 389, 432–434, 437, 518–519
company_info.py	118	18	50	16	84%	193–194, 200, 286, 368, 376, 379, 385–387, 392–393, 398–399, 405, 410, 432, 450
position.py	497	120	162	38	75%	486, 493, 540–541, 565–570, 628–629, 656–657, 691–696, 736–737, 764–765, 799–804, 1080–1081, 1108–1109, 1152–1157, 1228–1239, 1241–1242, 1252, 1290–1301, 1303–1304, 1314, 1350–1351, 1395–1404, 1406–1407, 1416, 1452, 1489, 1524, 1553, 1618–1619, 1621, 1623–1624, 1632, 1639, 1908, 1914–1919, 1931–1935, 1947–1951, 1962–1966, 1978–1979
app/model/blockchain
token.py	864	31	86	34	96%	99, 154, 158, 161, 164, 167, 416–417, 590–591, 615, 665–666, 673–674, 705–706, 906–907, 1046–1047, 1092–1093, 1222–1223, 1337–1338, 1377–1378, 1662–1663
app/model/db
base.py	28	4	2	1	85%	48, 51, 66–67
company.py	23	3	2	1	86%	52, 79, 82
listing.py	25	2	2	1	92%	52, 61
notification.py	69	4	6	3	94%	42, 53, 130, 139
tests/app
company_info_ListAllCompanies_test.py	401	0	6	0	100%
eth_SendRawTransactionNowait_test.py	281	0	0	0	100%
eth_SendRawTransaction_test.py	451	0	0	0	100%
eth_WaitForTransactionReceipt_test.py	89	0	0	0	100%
position_PositionCouponContractAddress_test.py	375	0	0	0	100%
position_PositionCoupon_test.py	407	2	8	2	99%	188, 195
position_PositionMembershipContractAddress_test.py	167	0	0	0	100%
position_PositionMembership_test.py	284	2	8	2	99%	146, 153
position_PositionShareContractAddress_test.py	637	2	10	2	99%	202, 211
position_PositionShare_Lock_Event_GET_test.py	368	0	38	0	100%
position_PositionShare_test.py	360	2	10	2	99%	208, 217
position_PositionStraightBondContractAddress_test.py	420	3	10	3	99%	198, 205, 207
position_PositionStraightBond_Lock_Event_GET_test.py	376	0	38	0	100%
position_PositionStraightBond_test.py	337	3	10	3	99%	200, 207, 209
position_Position_test.py	432	2	20	2	99%	72, 81
token_TokenHolders_Search_test.py	348	0	4	0	100%
token_TokenHolders_test.py	331	0	2	0	100%
token_bond_StraightBondTokenAddresses_test.py	340	0	6	0	100%
token_bond_StraightBondTokenDetails_test.py	116	0	0	0	100%
token_bond_StraightBondTokens_test.py	386	0	10	0	100%
token_coupon_CouponTokenAddresses_test.py	327	0	6	0	100%
token_coupon_CouponTokenDetails_test.py	107	0	0	0	100%
token_coupon_CouponTokens_test.py	372	0	10	0	100%
token_membership_MembershipTokenAddresses_test.py	327	0	6	0	100%
token_membership_MembershipTokenDetails_test.py	108	0	0	0	100%
token_membership_MembershipTokens_test.py	373	0	10	0	100%
token_share_ShareTokenAddresses_test.py	335	0	6	0	100%
token_share_ShareTokenDetails_test.py	111	0	0	0	100%
token_share_ShareTokens_test.py	382	0	10	0	100%
token_transfer_history_ListAllTransferHistory_test.py	264	0	2	0	100%
token_transfer_history_ListTokenTransferApprovalHistory_test.py	448	0	28	0	100%
token_transfer_history_ListTokenTransferHistory_test.py	545	0	2	0	100%
token_transfer_history_SearchTokenTransferApprovalHistory_test.py	854	0	18	0	100%
token_transfer_history_SearchTokenTransferHistory_test.py	742	0	2	0	100%
TOTAL	37881	1724	3700	770	95%

Tests	Skipped	Failures	Errors	Time
1268	0 💤	0 ❌	0 🔥	10m 13s ⏱️