feat: drop sqlite support

internal/db/migrations/00009_create_space_audit_logs_table.sql

@@ -7,7 +7,7 @@ CREATE TABLE space_audit_logs (
     action TEXT NOT NULL,
     target_user_id TEXT REFERENCES users(id) ON DELETE SET NULL,
     target_email TEXT,
-    metadata JSONB NOT NULL DEFAULT '{}',
+    metadata JSONB NOT NULL DEFAULT '{}'::jsonb,
     created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
 );
 

internal/db/migrations/00010_create_transaction_audit_logs_table.sql

@@ -5,7 +5,7 @@ CREATE TABLE transaction_audit_logs (
     transaction_id TEXT NOT NULL,
     actor_id TEXT REFERENCES users(id) ON DELETE SET NULL,
     action TEXT NOT NULL,
-    metadata JSONB NOT NULL DEFAULT '{}',
+    metadata JSONB NOT NULL DEFAULT '{}'::jsonb,
     created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
 );
 

internal/db/migrations/00011_index_audit_metadata_account_id.sql

@@ -0,0 +1,22 @@
+-- +goose Up
+-- +goose StatementBegin
+-- The account-scoped activity feeds filter audit rows by metadata->>'account_id'.
+-- A partial expression index is the right shape for this access pattern in
+-- PostgreSQL 17: it is small (only the rows where the field exists), uses a
+-- standard B-tree (cheap equality + ORDER BY created_at), and avoids the bloat
+-- of a full GIN over the metadata document.
+
+CREATE INDEX idx_space_audit_logs_account_id
+    ON space_audit_logs ((metadata->>'account_id'), created_at DESC)
+    WHERE action LIKE 'account.%';
+
+CREATE INDEX idx_transaction_audit_logs_account_id
+    ON transaction_audit_logs ((metadata->>'account_id'), created_at DESC)
+    WHERE metadata ? 'account_id';
+-- +goose StatementEnd
+
+-- +goose Down
+-- +goose StatementBegin
+DROP INDEX IF EXISTS idx_space_audit_logs_account_id;
+DROP INDEX IF EXISTS idx_transaction_audit_logs_account_id;
+-- +goose StatementEnd